Date: 1825
The subsequent operations of heating the dollars in an oven, and afterwards stamping them, are performed in separate rooms.  The stamping- machines are six in number, each of which is capable of coining ten thousand two hundred dollars per day, which gives a total, when the whole are at work, of 61,200.  The screw is the power used, and two negroes, with an over seer, are occupied in using it.