chris/CO149 (co149) wrote,

today's mail

received today, Vol 15, No 2 (Fall 2006) of the Journal of the Oughtred Society. This was a bit late due to production issues (and the fact that the youngest member of their editorial staff is 75), but this was expected. I was warned.

Today's envelope was extra heavy, though. The editors packed in a little surprise: Pocketbook of the Gauge Marks, a guide to the gauge marks found on slide rules by Panagiotis Venetsianos.

Any special mark a manufacturer added to a slide rule for added convenience of operation (e.g. almost all slide rules have a gauge mark for pi) is listed in a compact format. The booklet is 70 pages of 7x8.5", spiral bound. According to the author, this is a condensation of a 600-page French-language book he wrote several years ago.

Example: someone made a rule (don't know who, don't know what) that marked the spot at 1409 with the mark "Pr". According to the present manual, 140.9 is the atomic mass of praseodymium.

Big bonus!

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