Soon after my connection with Professor Morse as copartner, and at the time I was constructing an instrument for exhibiting the advantages of his telegraph to a committee of Congress, it occurred to me, that a plan might be devised, by means of which the letters of the alphabet could be employed in recording telegraphic messages. I immediately gave it my attention, and produced the following plan: Figure 52 represents a front and side view of the instrument. 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. [Illustration: FIG. 52.]