ts, sines and tangents as well aslogarithms may be found with it, and as the circular scale is C()uivalent toastraight one 5g inches long, resists may be read off with a fair de ;rce ofaccuracy. The small dimensions and light weight of the instrumentmake it a most useful pocket companion. Map… … 1743KNo. 1743.2. Boucher Calculator, each, giS.oO The Boucher Calculator resend)les an ordinary stem-winding watch,with an open face (glazed) back and front. Ratios are set off by meansof pointers or indices. It is 2 1-10 inches diameter by 9-16 thick, andvery convenient for the pocket. 129d J f…
