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 112
d one full revolution) drops back into its originalposition. By this movement of the butterfly nut e the shaft also slides laterallyback to its normal position, and at the same time the number wheels register o. The number wheels, which are arranged loosely on their shaft, arekept in their… … Fig. 23.—Improved Noiseless Zeroiser. which disengages the pawls from the number wheels when the latter arebeing zeroised. The pawls are thrown out of gear by this device and thenumber wheels are brought to zero by means of toothed segments (fig. 23). The zeroising crank is fixed on the right-hand…
