$70 Mr Steffen’s Description of a Sitometer. 
granary to the ship, when it is delivered to the person who re- 
ceives the grain into the ship ; and when the number of tallies , 
which are given out of the granary, corresponds with that re- 
ceived on board the ship, the business is considered to be well 
conducted. In these proceedings, however, in which expedition 
is often necessary, the nick-stick or chalk may be neglected, or 
a tally dropped on the way, or there may be some collusion be- 
tween the parties ; in which case, no remedy but that of mea- 
suring the grain over again can be had recourse to. To facili- 
tate the marking, and to lessen the probability of mistakes, I 
have contrived a simple machine, of which the following is a 
sketch, and a description of its mode of acting. 
Let aa (Plate VI. Fig. 1.) be a deep-toothed wheel, of any 
number of teetb, b a dog-head, and c a spring, to stiffen the 
hold of the dog-head on the teeth, d is another wheel, but the 
teeth are bevelled, and of less diameter than a , with its dog-head 
and spring^/C g is a spike upon the wheel a, to act upon the 
teeth of the wheel d, when a makes a revolution. In Fig. $. ft 
is a pointer, attached to the axle of the wheel a , with its point 
exactly opposite to the spike g , and upon it is a slider i, with its 
nut ft to fasten it by. The pointer marks the bolls upon the in- 
terior circle Z, and the slider indicates the half-bolls upon the 
exterior circle m. n is a single pointer, upon the axle of the 
wheel d , and marks the total bolls upon the circle o. When the 
pointer ft is moved by the hand, it proceeds from number 0 to 1, 
and the dog-head b passes over a tooth of the wheel a ; the next 
motion of the pointer marks $ ; that is, two half bolls, or one 
boll, as marked at the same time, by the pointer upon the in- 
terior circle l., Thus the pointer marks, till it comes to No. 50, 
when it has made a revolution of the wheel a , the spike of which 
g then acts upon a tooth of the wheel d, and causes the dog-head 
e to pass over one tooth ; and the single pointer n marks from 0 
to $5, the number of bolls. Thus, at each revolution of the 
wheel the single pointer marks other $5 bolls, till the wheel 
d also makes its revolution, when the number marked will be 
500 bolls. Hence, by increasing the number of teeth in the 
wheels, the number of bolls will also be increased ; and when the 
machine has to be used at a new heap of corn, the pointers can 
be set by the hand at No. 0. When the machine is thus used, 
