Modern instruments and methods of calculation : a handbook of the Napier Tercentenary Exhibition (1914)
Horsburg, E. M. (Ellice Martin), Napier Tercentenary Exhibition (1914 : Edinburgh, Scotalnd) · London : G. Bell · leaf 198
he following example. To read off 23500, which is (23*5Xios)*= SLIDE RULES 171 (235;) xi0?==(235) x 10* x I0- we pull out the slider so that the cross-line f may be at 100 of the rule. Then make cursor No. 5 read 23-5 on therule scale, and read off the digits of 23500 on the slider scale, by means… … Fig. 10.—Plan of Rule reversed showing Lazy-tongs Mechanism for keeping Cursors equidistant. It may be convenient to have cross-lines on the rule scale as well, tofacilitate computations. The accessory just described will apply to pocket slide rules or to largerones for office use. A modification…
