[Figure 55] is a top view.
[Figure 56] is a back view.
The same parts are represented by the same letters in the three views. In [figure 52], Q, Q is the platform upon which the whole instrument is placed. M and M are wooden blocks supporting parts of the instrument, K is the helix of the soft iron bar, H, passing through its centre, and there is another coil and bar directly behind this; the two making the electro magnet. G is its armature, fastened to the lever, F, F, which has its axis at I, (seen in [figure 55], at X, X.) R is a brass standard for supporting the lever, F, upon its axis, by means of two pivot screws: a and a are two screws passing vertically, through the standard, R, for limiting the motion of the lever, F, F. J is a spiral spring, at its upper end, fastened to the lever, F, and at its lower end passes through the screw, L, by which it is adjusted, so as to withdraw the armature from the magnet, after it has ceased to attract, and for other purposes, hereafter to be explained. N and O is a brass frame, containing the type wheel, B′, and the pulley, E and U. P and P represent the edge of a narrow strip of paper, passing between the type wheel and pulley, E. D is the printer, which, at the bottom, forms a joint with the end of the lever F and r. B represents twenty-four metallic pins, or springs, projecting at right angles from the side of the type wheel; each pin corresponding in its distance from the centre of the type wheel, to its respective hole, represented by dots upon, the index, C; so that if the pin is put in any one of the holes, the type wheel, in its revolution, will bring its corresponding pin in contact with it.
Fig. 52.
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.
Fig. 53. Fig. 54.
