Posted by R Johns on 26/09/2019 06:19:05:
Forget what I was buying. I was given the weight by a kid in grams. I asked "what's that in English" to which I just got a blank expression.
Is that surprising? The official UK decision to metricate generally was confirmed in 1965 and – apart from road signs – was pretty much complete by 1980. Anyone under forty is unlikely to have been taught 'English' units at school, and anyone under 60 who missed preparing for metrication as part of their education wasn't paying attention! You have to be at least 70 years of age to have been taught English units at school as the main system. Electrical units have been metric since mid-Victorian times.
To me weights and measures are just another tool. And like any other tool it should be improved, rationalised and changed as necessary to deliver better results. I think it's a bad mistake to see weights and measures as a National icon, somehow representing British culture and the good old days. I wonder how much shop-floor resistance to metrication damaged British industry when incomers trained at up-to-date Technical Colleges were told for forget all that rubbish by foremen trained before WW1?
The objection to the Imperial system is technical – it's internally inconsistent causing otherwise straightforward calculations to be riddled with weird conversions. Although fine for shopping and simple work Imperial is unnecessarily complicated and illogical as soon as the maths gets serious.
Some examples from my 1954 edition of 'Exercises in Workshop Mathematics for Young Engineers' illustrate the problem:
- What is the length of the side of a square field of area 10 acres?
- A rectangular tank of dimensions 10.75 in. by 8.5 in. by 7.25 in. is filled with water. Calculate its capacity (a) in cu.ft., (b) in gallons.
- A bar of steel is 3 in. square. If the steel weighs 0.28 lb.cu.in., find what length of bar will weigh 1 cwt.
- A bucket 15 in. high has a rim diameter of 12 in. and base diameter 10 in. How many gallons of water will it hold.
The 1954 questions are relatively gentle in that the input numbers are kept friendly and 'Young Engineers' were only required to give their answers in decimals of the main unit. Earlier textbooks demand answers broken down properly into Imperial sub-units. What is 5.154 gal. expressed as gallons, pints, and fluid ounces?
Attempting scientific and advanced engineering calulation in Imperial measure soon gets painful. What is a Poundal? In comparison, metric does a much better job keeping units rational. For example:
- Force: 1 Newton is the force required to accelerate 1kg by 1 metre per second per second
- Work: 1 Joule is the work done when an object is moved by a force of 1 Newton through 1 metre.
- Power 1 Watt is Work done at the rate of 1 Joule per 1 Second
The Imperial system entirely lacks this simplicity, for example work can be measured in foot-tons, foot-pounds, inch-pounds or inch-ounces. Again as an exercise for defenders of English measure, how many inch-ounces are there in a foot-pound? Or Watts in a Horsepower?
Best place for Imperial is in a museum. Expecting young people to understand it is wasting their time, especially as most older folk don't understand it properly either.
Dave
Edited By SillyOldDuffer on 26/09/2019 10:05:10