The Electric Telegraph

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108, by a small Fig. 108. Bain's Electro-chemical Telegraph.
metallic spring p, terminating in points like the teeth of a comb, the breadth of which is less than that of the perforations in the paper. This metallic spring is connected with the conducting wire which passes from the station of departure to the station of arrival. When the metallic spring falls into the perforations of the ribbon of paper as the latter passes over the roller, the galvanic circuit is completed by the metallic conta
...ct of the spring with the roller ; but when those parts of the ribbon which are not perforated pass between the spring and the roller, the galvanic circuit is broken and the current is interrupted.
A motion of rotation, the speed of which can be regulated at discretion, is imparted to the metallic roller by clockwork or other means, so that the ribbon of paper is made to pass rapidly between it and the metallic spring, and, as it passes, this M 162 THE ELECTRIC TELEGRAPH.
metallic spring falls successively into the perforations on the paper.


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