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Oct 09, 2021
02:05 AM

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Oct 09, 2021
02:05 AM

Units of length

Why is there a minus sign and not a plus sign.

I heard that this is some kind of military secret of the British - the enemy did not know the true height of the soldiers!

And more: F - feet, I - inch, F - ? Fraction?

6 REPLIES 6

Oct 09, 2021
06:53 AM

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Oct 09, 2021
06:53 AM

@ValeryOchkov wrote:

Why is there a minus sign and not a plus sign.

I heard that this is some kind of military secret of the British - the enemy did not know the true height of the soldiers!

If I told you, Valery, I'd have to shoot you. 😈

Why is there a minus sign and not a plus sign.

And more: F - feet, I - inch, F - ? Fraction?

Yes, Feet, Inches Fractions.

The dash (not minus sign) is, думаю, an old convention to show that the fraction relates to the inches. However, there should be space there, instead. Furthermore, 127 should not appear as a fraction - fractions are conventionally written as nearest reciprocal powers of 2 (or 3 or 10, but certainly not 127 for general use!).

Oh dear. I've told you ... <sigh> I guess I'll let you off this time, but don't think this sets a precedent.

Anyway, needless to say, the real crime and abomination here is those quote marks around the numeric value!! 👿

What is it with PTC and all these string-surrounding quote marks? Did they overstock them and are now trying to dump them on innocent Mathcad users?

Stuart

https://www.nist.gov/system/files/documents/2017/04/28/AppB-12-hb44-final.pdf

https://www.nist.gov/system/files/documents/2017/05/09/13-section-IVa-14-h130-final.pdf

6.11. Fractions.

(a) Inch-pound: An inch-pound statement of net quantity of contents of any consumer commodity may

contain common or decimal fractions. A common fraction shall be in terms of halves, quarters, eighths,

sixteenths, or thirty-seconds, except that:

(1) if there exists a firmly established general consumer usage and trade custom of employing different

common fractions in the net quantity declaration of a particular commodity, they may be employed;

and

(2) if linear measurements are required in terms of yards or feet, common fractions may be in terms of

thirds.

Oct 09, 2021
07:31 AM

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Oct 09, 2021
12:26 PM

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Oct 09, 2021
12:26 PM

Why not

Oct 09, 2021
05:06 PM

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Oct 09, 2021
05:06 PM

@ValeryOchkov wrote:

Why not

Because

a. The mixed number format is incorrect (no dash, just a thin space).

b. Nobody in their right mind would give ounces to such precision when 10/49 or 1/5 would be quite adequate (*except, of course, a mathematician giving advice to aeronauts in a passing balloon.* 😉)

c. The double use of 'oz' makes it look like the faction is being subtracted; there should only be one 'oz' because 13.204 oz should be represented as a mixed number (*standards, and all that*).

d. It would confuse Army caterers, who would, in turn, annoy the Army engineers tasked to build kitchen scales of such accuracy and precision.

e. The quotes, the quotes ...

Stuart

Oct 10, 2021
01:40 AM

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Oct 10, 2021
01:40 AM

In Russia, in such cases, we say that all ancient Greek mathematicians turned over in their graves. And what do they say in England in such cases?

Oct 10, 2021
05:14 AM

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Oct 10, 2021
05:14 AM

@ValeryOchkov wrote:

We'd say something similar in the United Kingdom (***).

Are you telling me that those weights are from the recipe for a πie from a mathematician's cookbook? Raspberry?

Stuart

(*) *many people from Wales, Scotland, Northern Ireland, etc can get a bit touchy when people confuse being England with Great Britain, and being English with being British*