Units of length

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@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! 

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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?

 

 

 

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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.

https://support.ptc.com/help/mathcad/r7.0/en/index.html#page/PTC_Mathcad_Help%2Funit_scaling_in_common_formats.html