282 G. B. Grant—-New Caleulating Machine. 
minute with perfect accuracy. The object of having one cylin- 
der nearly three times the size of the other is to secure this 
accuracy. e angular motions are equal, but the actual 
speed of the pin is nearly twice that of the wheel, ensuring 
that the claw shall strike the right tooth every time, even if 
of operations. Four or more fixed quantities, ABCD, etc., can 
be set up once for all, and either one be quickly brought to act 
whereas it usually takes from three to five minutes for each 
operation, 3 
