pushing the disk before it by crowding between it and the conical head, and causing the outer end of the arm to communicate a rotary motion to a wheel f, to which it is connected by a universal joint.
One in which the letters and figures are arranged around a circular plate and are brought consecutively to an opening, or otherwise specifically indicated.
The first of this class of telegraphic apparatus seems to have been that of Ronald, England, 1816.
At each end of the line he had clocks beating in exact unison; at least, such was the requirement of the invention.
Each clock-work rotated a disk having the letters and numerals on a circular track, and these were exposed in consecutive order at an opening in the dial, the two ends of the line showing the same letter coincidently.
The sender of a message watched till the required letter came in view, then made an electric connection which diverged a pair of pith balls and drew attention