Jim Frysinger wrote: >My guess is that the 1/6 and 1/12 inch divisions are useful for >page layouts,
O.K., so far. >figuring 72 picas per inch. If I recall, that makes a 12 point em equal to >1/6 of an inch. That's true, but it has nothing to do with this ruler. It's not as sophisticated as that. >I'm lost on the 5/32 inch divisions but two things come to mind. >First, that's darned close to 4 mm! More likely though is that it would provide >a leading allowance for 1/8 inch tall (9 point) type. See previous comment. (By the way, my own thoughts about the 5/32" graduations are tentative. Joe Reid may remember more about that than I do.) Bill Potts, CMS Roseville, CA http://metric1.org [SI Navigator] >On Tuesday, 2004 January 13 00:52, Bill Potts wrote: >> That's a very broad question, because there are so many kinds of rulers. >> >> I have a Canadian steel ruler from the early 1970s with two >scales on each >> of two sides. On one side, one edge is graduated in 5/32" units, with the >> other edge in inches, subdivided into 1/6 and 1/12. The inches themselves >> have two markings -- 1, 2, 3, 4, etc. and 6, 12, 18, 24, etc. >> >> On the other side, one edge has inches in 1/10, with each 1/10 >individually >> marked from 1 to 150. The other edge has inches with 1/4", 1/8", >1/16" and >> 1/32" subdivisions. The inches themselves are marked 1, 2, 3, 4, etc. and >> 150, 300, 450, 600, etc. >> >> The ruler has other features I won't mention yet. >> >> I want to see who can guess what kind of ruler it is, what some of the >> numbers mean, and what the other features might be. One clue is that, in >> spite of having no metric units whatever on it, it is still >useful and the >> units (and features) still have a valid purpose. >> >> Think "legacy systems." >> Bill Potts, CMS >> Roseville, CA >> http://metric1.org [SI Navigator] >.... >-- > >James R. Frysinger >Lifetime Certified Advanced Metrication Specialist >Senior Member, IEEE > >http://www.cofc.edu/~frysingj >[EMAIL PROTECTED] >[EMAIL PROTECTED] > >Office: > Physics Lab Manager, Lecturer > Dept. of Physics and Astronomy > University/College of Charleston > 66 George Street > Charleston, SC 29424 > 843.953.7644 (phone) > 843.953.4824 (FAX) > >Home: > 10 Captiva Row > Charleston, SC 29407 > 843.225.0805 >
