What were the lateral and line to line spacings on the old line printers? The ones with the whirling belts?
Jim On Tuesday 2004 January 13 13:12, Bill Potts wrote: > 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 -- 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
