The telegraph manual: a complete history and description of the semaphoric, electric and magnetic telegraphs of Europe, Asia, Africa, and America, ancient and modern.

384 VAIL S PRINTING TELEGRAPH.
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, fig. 1,
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,
Fig. 2. Fig. 3.
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Id
of the type-wheel, in its revolution, freely pass between them;
df' d are the sides of the joint, which are connected with the
lever F, fig. 1. 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 fig. 3
is shown a ratchet-wheel i, on the end of the roller E, a catch e,
and spring c', adapted to the rachet. Upon the release of the
lever F, fig. 1, 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. 4 represents a top view of the machine: s is the barrel
upon which is wound a cord, sustaining a weight which drives
the clock-train, and upon the same shaft with it is a cog-wheel
driving the pinion m on the shaft T; and on the same shaft T
is another cog-wheel, driving the pinion n of the type-wheel
shaft I'. K and K are the helices of the large magnet, of which
II and I are the soft iron arms. M I AIM M are the blocks which
support the instrument. r F is the lever, a and a its ad