There are 24 holes corresponding to the following letters of the alphabet. A, B, C, D, E, F, G, H, I, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, and the types are lettered accordingly. The cog wheels, T and S, are a part of the train of the clock. The lever, F, F, has two motions, one up and another down, and both are employed by an attachment at the end of the lever, _r_, and in the following manner: figures 53 and 54 represent a front and end view of the roller, E, and printer, D, (figure 52,) enlarged. D is the printer, figure 53, of the form shown by D, (figure 54.) E is the roller over which the paper, P, is carried. A is the front of the type having ears, _h, h_, projecting from each side. Through the sides of the printer, D, D, a rod, U, passes, in order to give more firmness to the frame. The rod projects a little on each side of the frame at J, J. These projections slide in a long groove in the frames, N and O, figure 52, by which the printer is kept in its position, and allowed freely to move up and down. It will be observed that the upper parts of the frame, D, D, extends over the top of the roller, E, and nearly touch each other, but are so far separated, as to let the type, A, of the type wheel, in its revolution, freely pass between them: _d′, d′_, are the sides of the joint, which are connected with the lever, F, fig. 52. From the construction of this part, it will appear that if the printer, D, is brought down by the action of the magnet upon the lever, the two projections, _k, k_, will come in contact with the ears, _h, h_, and bring the type in contact with the paper upon the roller, E, and produce an impression. In figure 54 is shown a ratchet wheel, _i_, on the end of the roller, E, a catch, _e_, and spring, _c′_, adapted to the ratchet. Upon the release of the lever, F, fig. 52, the spring, J, will carry down the lever on that side of its axis, and up at _r_, which will cause the roller, E, to turn, and consequently the paper, P, to advance so much by the action of the catch, _e_, upon the ratchet wheel, as will be sufficient for printing the next letter. [Illustration: FIG. 53. FIG. 54.]