Australian Metrication & American Procrastination

By The Metric Maven

One day while surfing the web I ran across this rainfall graph which was produced by the Australian Government. I longingly look at the rainfall amounts in mm, and would like to see millimeters used for rain and snow in the US. As one advocate I know said: Australia is “Metric Heaven.”

When discussing the success of metrication in Australia with another metric advocate, I quickly noticed he had looked at me in earnest, and almost pleadingly said “How did they do it?” His vocal pattern seemed to indicate that Australia had somehow solved a hyper-dimensional Rubik’s Cube while locked inside a trunk falling to earth to obtain metric. Australians are an English speaking, democratic society, and were able to become metric. The US claims to be the same, but is unable to change to metric.

The story of Australia’s metrication is well told in the book For Good Measure by Jan Todd. This book was published in Australia in 2004 and is a nostalgic look back on the history of the Australian metric change-over that is now becoming a distant memory.

In the 1970s Australia decided it would convert to the metric system. Australia would choose Alan Harper (1913-1991) to shepherd the change. Here is what historian Jan Todd has to say about this man:

Alan Harper was Australia’s metric man. From research scientist at NSL to Secretary of the NSC, he would next don the mantle of metric missionary and then head a metric conversion board. His goal was to convert the nation to the sole use of metric measurements. The all-pervasive nature of measurement made it a massive task, with all the minutiae of life put under the microscope and myriad decisions required on all implements—big and small, monumental and mundane—from the tiniest screw to the largest tanker. For that reason it had been avoided for decades by Britain, and therefore by Australia

Those in the know agreed that Alan Harper made it happen. His major opponents were tradition, comfort and apathy, as well as a little fear.

On May 29, 1968 an Australian Senate Committee concluded to unanimously to adopt the metric system exclusively as soon as possible. The majority of Australia’s trade was with metric countries. It was a clear, practical, economic decision.

Then government inertia took hold, there was uncertainty as to what department of government would take charge, which lead to political paralysis. The Metric Conversion Act was finally accepted and a Metric Conversion Board was assigned the task. Alan Harper was the obvious choice to head it. He was a rare combination of brilliant physicist and administrator, who had a passion to bring the metric system to his country.

Harper realized that in countries where the metric system was implemented quickly and decisively by the government, conversion had gone well. In countries which allowed the process to shepherd itself (such as in Britain) momentum was lost.

The process was to be voluntary, but pressure would be applied using strong legislative initiatives, and there would be significant penalties for non-compliance. Harper also saw that metrication should take place over as broad a spectrum of society and industry as possible all at once. This would immediately create a metric environment for as many citizens as possible, with no islands of imperial ecosystems to hinder the transition.

Communication with the public was of paramount importance in order to enlist them, and make Australians understand the changes. Perhaps the most important aspect of metric conversion was to use it as an opportunity for commerce to reexamine current industrial practices, and to streamline, simplify, and rationalize industries and practices. The Metric Board would act to shepherd and facilitate to this end, not to dictate details.

Alan Harper had a very effective partner in this undertaking, one John Norgard. He had the industry contacts which would smooth out, and help coordinate the metric conversion. The two complemented each other like salt and pepper. Norgard approached the heads of all the countries newspapers and asked them not to take an editorial stand against metric. Only once was this promise violated.

The Metric Board enlisted an army of specialists in multiple fields to help with this broad transition. They would act as liaisons on behalf of the nation in the coming transition. Despite some wavering by the Government during the decade, the transition remained firm

Weather reporters started to convert in 1972, and were finished two years later. Dozens of industries followed suit. Strangely, the conversion of women’s bras and biscuits (crackers) proved to be stumbling points. The number of fasteners used by a Ford plant, were reduced by a factor of four after metric conversion. The implementation of metric threads reduced the hodgepodge of bolts by 88% and nuts by 72% “In just one item, an inventory of 10,000 fasteners before metrication was cut to only 2500.”  According to Todd:

Greater uniformity in state legislation was making life easier in certain areas, especially in roads and building regulations. And rationalizations had been possible in many industries. The change to metric threads cut the variety of bolts from 763 to 93 (88 percent), nuts from 1368 to 387 (72 percent) and machine screws from 1248 to 300 (76 percent). BHP’s rationalization of rolled steel sections almost halved its range, while its flat sections were reduced from around 500 imperial lines to 160 metric ones.

The public demonstrated considerable anxiety concerning the single day changeover of all road signs and traffic rules. This was to take place on July 1, 1974. There were terrifying warnings of mayhem that would take place. In a non-event reminiscent of the Y2K bug, the ocean remained blue, and the cars on the freeways traveled as easily as they always had. When voluntary conversion time tables were violated, legal actions were taken to enforce the changes. The most important mandate was no use of dual units, they were not allowed.  Pat Naughtin, an expert on metric usage and conversion states simply “Don’t dual with dual!”  Direct metrication takes about a year, allowing dual units can inhibit conversion for decades.

The best path to direct metrication is the use of millimeters. Centimeters should not be used or encouraged in any way. No industry has converted with centimeters. The Australian metric conversion was nearly 75% complete by 1976, and by 1980 the committees had essentially finished their tasks.

As Jan Todd summed it up:

Australia’s conversion process had shown how a centralized, coordinated national program of measurement change could work. With strong government commitment, full legislative backing and a national body dedicated to developing policy and leading implementation, even a federation of six unruly states could be brought into uniform order.

 Meanwhile in the United States of 1975

Metric hearings were underway in October of 1975. Person after person appeared and testified that a voluntary metrication with no real government involvement and without penalties would work effectively. The hearings took notice that Australia’s metrication was successful. Their assessment was that Australia is “Currently moving rapidly toward a strongly metric environment—more quickly and easily than expected.” (pg. 59)

To my amazement The American Bar Association seemed to understand the importance of the Australian experience:

The reason why the Australian Post Office is converting its internal operations is to avoid becoming a customary island in a metric ocean with all the permanent training and recruiting problems which would be incident to that status.

Sports were selected as pacesetters because it was recognized that their early conversion would be a most effective way to generate public familiarity with metric usage  on a widespread basis.

So that the U.S. Metric Board may have a pole star to guide it rather than to be left to fend for itself without adequate congressional direction…[we recommend these changes to the law]

Yes, sports were converted, and considered a vanguard to pave the way for metrication in Australia. The American Bar Association (ABA) realized that the American metric legislation of 1975  made “no change to existing law.” They suggested stronger wording be introduced into the bill.

Esther Peterson of Giant Food also understood the importance of following and learning from the Australian example:

The Australians have given us a fine example of a smooth transition to metric which involved the public all the way. The primary aim of The Australian Metric Conversion Board was to overcome public apprehension. Dual labeling and conversion exercises were avoided for a “think metric” approach. The consumer was saturated with metric information. Special target dates were set for each sector—speed and road signs, temperature, clothing, et cetera—so the consumer knew what to expect and when. The board published booklets, distributed posters, showed films, gave speeches, and utilized the media. There were very few cases of unfair practice in the marketplace, because no-one dared to cheat the consumer with a metric-sensitive press watching every move.

The success of the Australian metric program was also enhanced by a strong initial and sustained support by the Australian Government. We need that same kind of support from all branches of our own Government. Many agencies have already begun to prepare for metric. All need to move ahead.

The most important point here is that the Australian legislation utilized a metric conversion board which kept their public informed right from the beginning. Today, a little over 5 years after legislation was passed in Australia, the conversion process is almost completed.

Esther argued that “guidance in the form of Federal Legislation is needed, We need a uniform approach in order to implement a smooth and total conversion in all areas…..where standards are set and followed, target dates are met, and uniformity in practice exists.”  Her wise words would fall on deaf ears and the vacuous metric legislation would not be strengthened.

The Australian notion of a “voluntary” metrication appears to have been lost on Dr. Ernest Ambler who was Acting Director of the National Bureau of Standards:

They have taken great pains to emphasize education. Not only education with regard to the technical details of the metric system, but also with regard to the public information aspect of the conversion. They have taken great pains to tell the public what is happening, when it is happening, and why it is happening.

So the public information aspects have been an important factor.

I would say that these are the main features of the Australian experience and plan that we might well emulate. Mr. Chairman.

Senator Inouye. Was it mandatory or voluntary?

Dr. Ambler. It was voluntary, certainly, Mr. Chairman; voluntary, but well coordinated and managed.

He seems to believe that all of the metrication in Australia just happened, and the government just stood back and offered some advice as the country changed. Everyone could just do what they wanted to become metric. The current NIST director has an even more lax attitude toward metrication.

Detractors appeared to attack the credibility of Australia’s metric conversion methodology. Donald Peyton of the American  National Standards Institute (ANSI) had this to say:

Senator Ford. Thank you Mr. Peyton

I asked Representative McCauley and Professor Johnson what kind of timetable would be desirable—the minimum and maximum. Do you have a recommendation as to what target dates and number of years we should plan for completion?

Mr. Peyton. Well, frankly, Senator, having worked in the field where you have to get a reasonable consensus to be effective, we have concluded that mandated time spans long or short, really are counter-productive. I’ll tell you why. In the United States, you have an entirely unique situation. People have been talking about Australia, comparing a nation of 13 million people to one of our size, and the concentration of industries is like comparing a high school football team with the Green Bay Packers. With all the things you have to coordinate and all the different facets, we really believe that the flexible approach of H.R. 8674 without mandated times is preferable, the major reason being if you give some people 10 years, they are going to take 10 years, but there are other segments that are going to be ready to go and they shouldn’t be held up.

Well Mr Peyton, it appears that your fictitious High School team won the Superbowl and the Green Bay Packers have yet to win a single game when it comes to your metric simile. Your statement is 37 years old now, and just as incorrect and naive.

Alan Harper did not appear at the 1975 Metric Hearings. But after the verbal  testimony there is a long written section entitled: “Additional Articles, Letters and Statements.”  Nine pages in (pg 177-178) we find:

Congress of the United States,
          House of Representatives,
          Washington, D.C., October 7, 1975.
Hon. Warren G. Magnuson,
Chairman, Semite Committee on Commerce,
Dirksen Building, Washington, D.C.

Dear Mr. Chairman: I understand that your committee will be having hearings on metric conversion legislation on October 8 and 10.

The enclosed correspondence from Mr. Alan Harper, Executive Member of the Australian Metric Conversion Board, points out the difficulty in considering a voluntary conversion plan.

If possible, I would like to have Mr. Harper’s letter inserted in the hearing record for consideration by members of the Senate Commerce Committee.

Thanks very much.

          Donald M. Fraser.


          •        •        •

          Metric Conversion Board,
          St. Leonards,N.S.W. 2065, September 23, 1975.
Congressman Donald M. Fraser,
Congress of the United States,
House of Representatives,
Washington, D.C.

Dear Congressman: Thank you very much indeed for sending me the pages of the Congressional Record containing your statement and the report of the debate on the Metric Conversion Act, H.R. 8674.

I was, of course, aware of the passage of the Bill in Congress and of the very gratifying voting figures but it was not until I read the Record that I realized just how strongly the Bill was supported on the floor of the House and that there was no spoken opposition to it.

Initially the event did not receive in our Australian papers the publicity it deserved (a brief announcement is attached) so I endeavored to rectify this with comments for the press, a copy of which is also enclosed. This was taken up in some of our major newspapers.

The treatment given by the papers to this decision in the House of Representatives was in marked contrast to “Metric Bill Rejected” headlines used by the papers when the previous Bill was defeated. I think this is symptomatic of the general metric climate in Australia now, that it would be big news if USA decided not to go metric but merely a normal development, not worthy of headlines, that a Metric Bill has been supported.

Nevertheless, we can make very good use of the presumptive passage of the Bill, of the strong vote in favour of it, of the many “quotable quotes” in the text of the report of the speeches and of the fact that there were no speeches opposing it with those who still refuse to acknowledge that USA is well and truly on the metric path. Our small but vocal “Australian Anti-Metric Association” has lost another handful of feathers from its plumage and must be finding it increasingly difficult to remain airborne.

Our operation is still proceeding very well. I hope to send you our 1974/75 Annual Report shortly which summarizes the position not only for the past year but to some extent for the five years since the Metric Conversion Board was appointed. In most of the technical areas conversion is either complete or headed for completion. More intractable are the sectors involving the public in the use of metric units in affairs calling for some decision-making—even if only as minor as deciding whether to buy one or two kilograms of sausages. While one can go a long way in these sectors with a wholly voluntary conversion, we have come to the same conclusion as South Africa, United Kingdom and Singapore that in such activities some degree of control of trading practices is necessary if a prolonged period of consumer confusion and trader disadvantage is to be avoided.

It is, of course, not possible to mount a wholly voluntary metric change in the sense that every individual has a free choice. Consider the conversion of statutory speed limits and other changes calling for embodiment in legislation. “Voluntary” in this context has to be taken to mean that the choice of a program and plan for conversion in a sector is made voluntarily by national leaders in that sector but thereafter it is supported by all the pressures that can be marshalled, through procurement, legislation, appropriate amendment of technical standards, adherence to the program by government and large organizations and so on.

Unless your Metric Board can enlist such support for the programs developed voluntarily, the agreement accorded many of these programs may in the event prove too fragile to ensure their implementation and aspects of your metric operation which provide their own incentives will get out of kilter with those needing some additional stimulus for their accomplishment.

By accident of history Australia is currently several years ahead of USA in metric conversion so I believe we can offer useful experience in situations in which there may be some parallel between the circumstances in our two countries. Please be assured we will be keen to make this experience as fully available as possible. I think the North American-Australian Metric Conference held here last April, in which you were unfortunately unable to participate, was a good indication of what we have to offer.

With kind regards.
Yours sincerely,
          A. F. A. Harper,
          Executive Member.

Alan Harper seemed to understand that US metrication authorities like Ernest Ambler of NBS interpreted voluntary to mean “to just do your own thing” in this epistle. Clearly Harper realized that the US had produced legislation that was a 10 kilogram turkey. Alan Harper clearly states that by voluntary, he meant it will be voluntary for industries to decide how they want to become metric. It is mandatory that they become metric, that is not voluntary as persons in the US misrepresented.

To mirror what had been done in the US, with that of Australia would be this:

  1. Pass legislation invoking Section 8  Article 5 of the US Constitution and make metric the exclusive measurement system of the US.  Because it is Federal law, it would supersede any local State and County laws.  The existing weights and measures infrastructure, which is tasked with enforcing and regulating weights and measures, would now switch to metric.  The laws which currently enforce the use of Olde English would now be brought to bear to enforce metric. In 1975 The American Bar Association argued that legislation was not required and this could be directly ordered by the President who could create a “Measurement Czar.”
  2. The change to metric would not be optional because existing agencies would now enforce metric as the exclusive system as they had USC, but the way in which metric would be accomplished would be “voluntary,”  meaning the government would not impose methods on the industries of the US. They could all decide for themselves how they would comply with the law.  A metric board would be set up based on that created in Australia and usher along the changes and attempt to smooth the changes along.  The board would break all of the US economy up into categories like those created by Australia and then appoint committees as they had done.  They would negotiate M-Days as the Australians did for different industries and hold them to compliance. Metrication in Australia: A Review of the Effectiveness of Policies and Procedures in Australia’s Conversion to the Metric System by Kevin Wilks (1992) would be an invaluable initial guide to help US industry convert. A downloadable copy is available under the metrication resources tab.

In April 1979 Mr. Harper was asked in person by a US Metric Board member if Australia could have accomplished what it did, had it been working under metric legislation similar to the U.S. Metric Conversion Act of 1975

“No” was his emphatic single word answer.

Alan Harper was right about metrication in Australia and in the United States. Thirty two years after Australia completed their metric conversion, the US has not even begun to untangle itself, if it ever does, and the Green Bay Packers still use yards. In Australia their signs are in metric:

Parking Ramp Clearance Sign in Australia — Photo by Mike Joy

Related Essays:

How Did We Get Here?

John F. Shafroth: The Forgotten Metric Reformer

Testimony from the 1921 Metric Hearings

The Metric Hearings of 1975 — The Limits of Social Norm in Metrication

A Tale of Two Iowans

John Quincy Adams and The Metric System

If you liked this essay and wish to support the work of The Metric Maven, please visit his Patreon Page and contribute. Also purchase his books about the metric system:

The first book is titled: Our Crumbling Invisible Infrastructure. It is a succinct set of essays  that explain why the absence of the metric system in the US is detrimental to our personal heath and our economy. These essays are separately available for free on my website,  but the book has them all in one place in print. The book may be purchased from Amazon here.

The second book is titled The Dimensions of the Cosmos. It takes the metric prefixes from yotta to Yocto and uses each metric prefix to describe a metric world. The book has a considerable number of color images to compliment the prose. It has been receiving good reviews. I think would be a great reference for US science teachers. It has a considerable number of scientific factoids and anecdotes that I believe would be of considerable educational use. It is available from Amazon here.

The third book is not of direct importance to metric education. It is called Death By A Thousand Cuts, A Secret History of the Metric System in The United States. This monograph explains how we have been unable to legally deal with weights and measures in the United States from George Washington, to our current day. This book is also available on Amazon here.

20 thoughts on “Australian Metrication & American Procrastination

  1. The “voluntary” interpretation that the US clung to did more damage to the US economy than just a failure to complete metrication had. The voluntary approach gave many industries and businesses the reason to change thus establishing metric islands in a USC sea.

    These companies that successfully went metric had to deal with companies that fought the change tooth and nail and with a population fully uneducated in metric. Some companies who attempted internal metrication met with strong resistance from their workforce.

    When Ronald Reagen ended metrication in the 1980s he also opened the door for businesses to leave the country and go elsewhere looking for workers and still be allowed to import the products back into the US tariff free. This allowed many companies who wanted to metricate and use the metric system to get around resistant suppliers and workers. Simply by closing the US operation, going to a metric country and having the work metricated and produced overseas, American companies saved untold costs that would be incurred by having to overcome resistance. Suppliers went out of business and workers had to find employment in the lower paying service sectors. America has become a nation of burger flippers and barmaids.

    The American industrial scene is heavily divided and any nation or people divided amongst itself comes to ruin. This is very evident in the US today. Metric industries don’t deal with non-metric industries and vice verse. The cost of this division would have paid for metrication over and over again.

    The US media was the main reason metrication failed. It filled the heads of the population with metric horror stories. Writers from anti-metric companies insisted nothing would change with metrication. But every number would become funny. A pound would still be a pound but would have to be expressed as 0.45359237 kg, a mile as 1.609344 km, etc. Every dimension would be soft converted to numbers that American tongues would trip over. With this type of negative publicity metrication was doomed to failure.

    But time is on the side of metric users and the world metric community. Time is against the US. As each day passes, the failure of the US to metricate is being paid for by lost jobs in manufacturing, increased poverty in America’s homes, bankrupt cities and states. And this is just the beginning. By the time the course the US is taking towards it destruction reaches its peak, those who brought it on will either be dead or close to death and holding them accountable for the carnage they brought won’t be possible.

    It is debatable now if a decision to follow Australia’s plan now would reverse the fortunes of the US and bear positive fruit or if it is too late and no amount of effort will restore the past fortunes of this dying superpower.

  2. To correct Ametrica’s repetition of an awful urban legend, President Reagan did NOT “end metrication.” All he did in 1982 was to cancel the funding for the U.S. Metric Board, which, at that time, was so arrhythmic with internal strife and lack of national leadership that I think Mr. Reagan’s action made good sense. U.S. metrication did not depend upon that moribund board. It had been killed by the Metric Conversion Act of 1975 itself, which gave the national goal only feeble direction to begin with, and with no deadline for completion.

    • I stand corrected Paul, but my point was that the action of President Reagan occurred at the same time he opened the door for business to go elsewhere to have their products made in metric if that was their desire.

      Closing down the metric board for whatever reason was a symbolic gesture that in the minds of most of the population meant the people and small businesses would not be forced or pressured to metricate.

      By giving business the choice to have products made in metric in metric countries, they were not held hostage by anti-metric forces who would have made it impossible for some companies to work in metric in the US.

      The cost to metricate can skyrocket if you have to deal with a strong resistive force. Educating a resistive workforce and enduring costly errors would be enough to give up on metrication. But, when you can go elsewhere and have your metric products designed and built in metric and can have the finished product brought back into the US tariff free, then any negative effects that resistance can cause are negated.

      The Metric Conversion Act of 1975 was weak and feeble in an attempt to give dissenters and the resistance the opportunity to sabotage metrication and force businesses to work in USC in the US. The resistance won the battle against metrication but lost the battle to force businesses to stick with USC.

      The division that this issue has caused is a major factor in why the US economy today continues to decline as manufacturing jobs are not being offered to Americans and only the low paying service economy somewhat thrives.

  3. I like reading the excerpts of different types of documents, and also learning about the varied strategies to prepare for a change to metric. Thanks!

  4. Australia’s metric conversion was very much driven by industry. In an era before calculators and desktop computers, the simplest calculations involving Imperial units were time-consuming and difficult, wasting a lot of manpower. This changed with the introduction of the metric system. Also, as mentioned in the article an increasing amount of Australia’s exports were going to metric customers.

    Australia’s system of giving leading figures in each industry control of their own conversion plan was successful for at least four reasons:
    • Each industry sector could make the conversion at its own pace.
    • Each industry sector set its own standards and could choose what was the best result for themselves.
    • The industry had ownership of the result that they achieved and the outcomes were decided from within the industry rather than being imposed from outside.
    • The people making the decisions would be answerable to their peers in the industry, thus giving them an incentive to make their decisions correct in a technical sense and workable in practice.

    • Peter,

      In the eyes and minds of most of the population the government is seen as the reason countries metricate. It is never explained to most people that the industries are the force behind metrication for the economic reasons you mention. Individual companies can not metricate in a vacuum. They need a nationwide coordinated effort and that is where government comes in.

      Unlike Australia and other countries where all industries supported metrication, in the US it was only the large multinational industries. The small and medium businesses opposed it.

      The small and medium businesses in the US were able to convince the media to oppose metrication by publishing horror stories of mayhem if metrication happened. The claim was that metric would be soft and the old sizes would remain resulting in a long string of numbers the American consumer would trip their tongue over.

      Despite the efforts of the Australian Anti-Metric Association run by Bob Parry and his tired old arguments opposing metrication being publish in some papers of the time the media did not wholeheartedly support him. Small and medium businesses supported the bigger industries unlike the US where they worked against each other and continue to do so to this day.

      It is obvious that the way metrication was handled in Australia versus the US is that Australia is more of a country in which the greater good for the present and future is considered contrasted to the US where what’s in it for me now and who cares about the future is the selfish attitude that takes precedence.

  5. “It is obvious that the way metrication was handled in Australia versus the US is that Australia is more of a country in which the greater good for the present and future is considered contrasted to the US where what’s in it for me now and who cares about the future is the selfish attitude that takes precedence.”

    Well said: that’s also exactly why the US is so anachronistic, today; i.e., most politicians & Co. (big business, etc. etc.) are still too occupied with “other” things, sadly (and most “ordinary” people – even more sadly – just don’t care, mainly for historical reasons)…

  6. … So, if the US “consolidated system of power” were less concerned about being the policemen of the world, etc. etc. (something that nobody really wants, indeed…), maybe things could change for the better, also for the metrication side of things (alias more time to think, really!) – who knows…

    Of course, we also have such problems in Europe – but the US evidently also has additional problems, which they don’t seem to even realize, sadly.

    As for Australia, its was in the ’60s-’70s, when there was much more ideality and projection towards the future than today’s perennial (powered by an almost mafiosi-like degenerated “capitalism”) “pseudo-future-like” present.

    The global situation is not good, anyway…

  7. BTW, the 2100 mm clearance sign would perhaps have been better rendered as “2.10 m” (at least, in Italy, where Iive, it would have been so): more intuitive, so to speak…

    • Sven G Please consider reading Naughtin’s Laws and in this case specifically Number 2. I have heard (but not verified) that Italy has retained a lot of pre-metric multi-unit usage in their construction drawings with two decimal points and utilizing the format: meters.centimeters.millimeters. In Australia, construction uses mm only. This is the subject of my blog Building a Metric Shed. The use of 2100 mm in Australia, because they construct with mm only, is almost certainly as intuitive as 2.1 meters and probably more so. As I’m sure you are aware, I would discontinue usage of the centimeter if I had the authority.


      • Yes, in Italy and also elsewhere in Europe, the centimeter is quite used in everyday life, and eliminating it doesn’t seem so realistic: and that’s probably the case for most countries that have bene metric for more than a century or so.

        Personally, anyway, I find that “2.1 m” conveys a more “real” feeling for the height in question, but that’s just a personal opinion.

      • Have been…

        As for technical drawings and related things, I think that millimeters are used exclusively also in Italy, at least in electronic and mechanical engineering; not so sure for the construction field – but others might perhaps be better informed on this…

        In everyday life, colloquially the height of a person and similar things are generally expressed as “X meters and YZ centimeters”: again, mainly for historical reasons.

        Australia has been able to skip the centimeter probably also because it metricated relatively recently…

    • Sven G.

      Agreed. Australia needs to get over its fear of decimal points. I think most nations would use 2.1 m, not 2100 mm for this sign.

      The US would allow truncation to feet and whole inches, or to the tenth of a meter (MUTCD). The UK would allow truncation to feet and a multiple of 3 inches, or to tenth of a meter. Canada would allow truncation to a tenth of a meter. (Truncation rather than rounding allows a little safety factor, the clearance is AT LEAST what is posted.) None of those nations would allow the pictured sign on a public road (not sure about a private parking lot). It’s not just a good idea, it’s the law.

  8. … And, BTW again, also Britain is far away form being fully metricated, on the front of road signs (still in miles, only because it “costs too much” to change the situation – sic!): a real shame, being that it is an integral part of the EU, and thus should also fully share its units!

    … Well, those sad things apart, let’s think about something more future-like: for example, unify the driving side for roads and railroads; and the electrical frequencies and voltages; etc. etc.

    SI is only the first step – many other technical things still remain to be rationalized, in a planetary world… 😉 🙂

    • An interesting article (maybe already published here) about road signs:

      … where, indeed, “4.4 m” is used, and not 4 400 mm.

      Well, are we at “Europe vs. Australia”? 🙂 🙂

      Of course, IMHO, both are valid: and one could also, for example, say “4.400 m” – metres and millimetres accounted for, at the same time.

      Even if it maybe looks a little over-precise, so to speak..

      • Sven G and Others:

        Good point on “over-precise” using “4.400 m” for 4.4 m. However, under the circumstances, since the precision is not really the millimeter, “4.40 m” should be the way to go, even if such indicates meters and centimeters.

        Wrt centimeters, although I agree in spirit with MM’s powers-of-multiples-of-three argument, not using centimeters at all in day-to-day living will just sometimes give us some unnecessary spurious precision.

        A panacea? Consider MM putting together a metric dictionary, which of course would not include hecto-, deka-, deci-, and centi-. However, such should include “centimeter” with, as regular dictionaries have, the label “informal”.

        • David B

          I have an entry in my glossary about this (which may need a slight alteration now that I think about it):

          Implied Precision Fallacy — This is the notion that the size of a measurement unit determines the precision which one must use when measuring. For instance if one uses mm to measure a person’s height, say 1715 mm it is often argued this is “too much precision” and 171.5 cm should be used and rounded to 172 cm instead. This is pedantic measurement folklore, and has been demonstrated as such by the Australian Construction Industry. They use mm exclusively for building construction, not because they must have mm precision (although that’s not undesirable), but because they can use integers and eliminate decimal points. It is the ease of usage of the metric system that drives the use of a given prefix. Naughtin’s 2nd Law: Prefer Measures Without Decimals. (i.e. choose prefixes in groups of 1000 (see Engineering Notation) so that you may use integer comparisons without decimal points) Measurement progresses as measurement values are more precise and accurate. Setting a limit on precision undermines measurement advancement.

          The Implied Precision Fallacy is also a form of Continuum Fallacy. That is, that at what point have I removed one more hair from a person’s head that they are now called bald. Bald men have hair around the edges. At what point do I have too much precision? US Rulers have 1/32 of an inch on them. A mm is 1/25 of an inch? Is 1/32 too much precision for everyday use also? Why would a mm be too much then? The Wikipedia entry is better at explaining it. This “too much precision” fallacy is asserted by pedants, but I have no idea how they can justify it, other than as folklore. There is often an irrational terror of using four digit numbers which the Australian Building Trade has lost long ago, but persists elsewhere. Embrace the power of Arabic Numerals.


          • Anyway, in everyday life, IMHO, it is more important to have short numbers than avoiding decimals: so, 2.1 m still seems better than 2100 mm.

            Engineering is another story.

            Again, only personal opinions (I’m not a purist)…

            BTW, a curious thing is that the powers of 10 used in SI are 3, 6, 9, 12 and so on: thus, essentially, part of a duodecimal or similar system; while one could also theoretically expect 5, 10, 15, 20 (or 2, 4, 6, 8, 10, …) and so on to be used. Of course, that is probably also because the concept of a thousand was already there and very strong, also in other and older measurement systems (for example, the ancient Roman M).

            Maybe a base 8 or base 12 numerical system would have been better; but now it’s probably too late, and we must keep the decimal one (not so bad, after all)…

        • Or one could simply continue to write “4.4 m”, with the understanding that this means not only 4 meters and 4 decimeters, but also 4 meters and 40 centimeters, and even 4 meters and 400 millimeters: the additional zeros are hidden, implicit.

          Of course, for everyday use, above all.

  9. BTW, I just got an LG Smart TV set for my renovated vacation house in Sicily, and it says, on the package, “106 cm [42]”, thus giving the diagonal of the screen in centimeters and also old inches (albeit rather implicitly: no ” sign), at the same time.

    No millimeters, thus, sadly…

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