Dear reader, this notice will serve to inform you that I submit to the public a small machine of my invention, by means of which you alone may, without any effort, perform all the operations of arithmetic, and may be relieved of the work which has often times fatigued your spirit, when you have worked with the counters or with the pen. As for simplicity of movement of the operations, I have so devised it that, although the operations of arithmetic are in a way opposed the one to the other—as addition to subtraction, and multiplication to division—nevertheless they are all performed on this machine by a single unique movement. The facility of this movement of operation is very evident since it is just as easy to move one thousand or ten thousand dials, all at one time, if one desires to make a single dial move, although all accomplish the movement perfectly. The most ignorant find as many advantages as the most experienced. The instrument makes up for ignorance and for lack of practice, and even without any effort of the operator, it makes possible short-cuts by itself, whenever the numbers are set down.