[USMA:28282] RE: question

[Bill Potts]

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]     -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]On Behalf Of john mercer Sent: Monday, January 12, 2004 20:59 To: U.S. Metric Association Subject: [USMA:28279] question  I forgot to ask this question in my last posting. Does anyone know how long rulers have been double sided in the States?  They have been double sided in Canada for many years.  Doreen was teling me that when she was in grade school in the fifty's she remembers rulers with cm as well as inches. Thanks.