On Tue, Dec 13, 2011 at 08:19, Chuck Harris <cfhar...@erols.com> wrote: > > Metric vs English is purely about a set of arbitrary constants. > > Decimal pounds, decimal inches and decimal seconds is just as > arbitrary, and just as easy to use as the metric system.
I would agree, as long as you stay within a single version of the "English" system. But where the metric system has an advantage is that the units with the same name are the same size everywhere; that's not true of "English" units. I can remember mixing Kodak photographic chemicals for darkroom use, where the mixing instructions are in terms of ounces and gallons. But I was in Canada, where the Imperial (British) ounce and gallon are both different volumes than the American (and thus Kodak) units of the same name. I didn't *have* measuring cups with US ounce markings. We solved the problem by converting the "foreign" units to ml and litres, which we were equipped to measure. If I remember correctly, Ilford's photo chemical mixing directions were already in metric, so they applied worldwide without any units confusion. Fortunately, the inch seems to be the same size everywhere, so I don't have to figure out whether someone is talking about British inches or American inches. I have a small lathe with inch leadscrews, and a small milling machine with metric leadscrews. Neither measurement system is particularly better or worse than the other. Many of my measuring tools can display in either system. Imagine the chaos if the second was a different length of time in different countries. - Dave _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.