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 111
ee pins by means of the lever h, pull the lever huntil three pins project from the pin wheel, and by revolving the crank oncethe number wheel E of the product register is moved three places, thus theproduct register which previously showed an 0 now shows a 3. By turningthe crank three times the sum…
