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 121
equal to the number of notches, past which the rack hasbeen allowed to fall till brought up by the stop-wire. In order that thesewheels shall always show the total sum registered by the machine, a carry-ing device is necessary from the wheel corresponding to the units place,to the tens place, and… … Fig. 33. but merely releases a stop, which, when no total is being carried, limitsthe rise of the succeeding rack. Hence, if a carrying operation is to bemade from the units to the tens wheel, the cam on the former displaces astop in the path of the tens rack, and, as a consequence, on the return…
