280 G. B. Grant—New Calculating Machine. 
Two parallel cylinders are geared to turn together. One 
cylinder is larger than the other, but the gears are equal, so 
that one turn of the handle on the larger revolves both once. 
The larger cylinder slides laterally on its arbor, and can be 
placed opposite any part of the smaller at pleasure. 
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On the small cylinder are a number of recording wheels, 
more or less according to the capacity desired. ach is pro- 
vided with thirty teeth, and a numeral is stamped at each tooth. 
A fixed point, R, is chosen as the reading point, and the number 
shown at any time at that point is the reading of the wheel. 
On the large cylinder are a number of driving wheels, each 
having an adding pin, P, which can be fixed in ten different 
positions by the pin at 7. 
a bar between the cylinders is a row of fixed spring claws, 
one for each recording wheel. If the claw be pushed slightly 
re > side, it will drop off its catching pin on to the wheel an 
old it. 
As the handle is turned, the recording wheel revolves with 
its cylinder, but when the adding pin strikes and lets down the 
claw, it will be held still till the lifter L is reached, by which 
the claw is returned to its pin and the wheel allowed to pass 
on. It has, by being held, been carried over a number of teeth 
from its original reading, more or less according to the position 
of the adding pin on its cylinder. If the adding pin is placed 
at its zero position, it will come to the claw simultaneously 
with the lifter, and the wheel will not be affected. But if it be 
placed at 7 for example, it will reach the claw seven teeth in 
advance of the lifter, and the number seven will be added to 
the wheel. 
7 The action between each wheel claw and adding pin is the 
_ Same, and it is plain that the number represented by the setting 
