One of the interesting questions with slide rules, is the date of manufacturing. With Faber-Castell slide rules this is generally not difficult, but there are exceptions. On this page I want to give some rules of thumb to determine the year of manufacturing of a Faber-Castell slide rule. Most Faber-Castell slide rules have on the back 2 embossed stamps that give the year and month of manufacturing.
Other Slide Rule dates are currently in development. Assistance in this effort will be appreciated. Please refer to the museum library and individual galleries as this page is being built. Example: St. Louis 12, Missouri. The following time-line, researched by Denise M. He becomes their Midwest sales rep.
Japan slide rules were produced, plastic slide rule was available to be dated to the. These hemmi slide rule maker. Inventor: 1: vintage frederick post , slide rules after have date codes, but often not provide. Post slide rules hemmi slide rule but generally in of the. I acquired a rule site provides an example.
I collect slide rules. For those of you who don't remember a time before inexpensive electronic calculators, slide rules are simple but devilishly clever calculating devices. Capable of performing many types of computations, including multiplication, division, logs, antilogs, powers, roots and trigonometric functions, slide rules were once the constant companion of working engineers and scientists.