Quote:
Originally Posted by sir_pudding
The US Customary system was never officially called "Imperial". Prior to 1824 that system was just English common measures.
Which is technically incorrect.
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There comes a point when prescritivism becomes erroneous in its self.
GIven that many US texts list US Customary as "Imperial" excepting for the gallon and 5th... where US and Imperial are differentiated. It's become a footnote, that by law, it's "US Customary Measure" and that, pre-metricization, the UK adopted a larger standard for gallons, tons, and a couple other obscure measurements.
Arguing it isn't imperial measure, when it's routinely taught as such doesn't do much for your public image, and doesn't do much to inform the reader of the real situation.
Now, it is worth noting that the US military still has some non-SI tools for non-SI fasteners... but so does almost every shade tree mechanic in the US, and not a few in Canada.