Archived posting to the Leica Users Group, 2015/11/03
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]For a fun read.... http://www.ebay.com/itm/K-E-Keuffel-Esser-4012-Thacher-with-case-Thatcher-Sl ide-Rule-Calculator-/331693807591?hash=item4d3a7dd7e7:g:eR0AAOSwWnFWCXpd THACHER Slide rule by K+E Note that on EBay, there are several 7 foot giant models for the class room... Note that in about 1970 or so, simple electronic calculators became available.....originally made by TI using the predecessor of the Intel 4004 uP. Atr that time, slide rules were still very common is use at NASA..... I have a slide rule that was made for flash exposure calculations.... never figured that one out..... Frank Filippone Red735i at verizon.net All still work as well as they did when they were new. No batteries are required. Bear in mind that most of the bridges, all of the WW2 airplanes, and all Leica lenses prior to the Summicron were designed using slide rules and mechanical calculators. Will the Leica SL still work in half a century? > http://gallery.leica-users.org/v/Larry+Z/Old+stuff.jpg.html > Larry Z > >