to ground and its other pole to the armature s2, and the magnet S 2. The front stop of this armature is insulated ; its back-stop is connected to the main line, through the line ul, switch U 1 and the circular table of contacts. 'Ihe local battery L, IL has its circuit closed under normal conditions through the path indicated by'the arrows. The armature s 2, is therefore drawn against its insulated front stop, whenever the circuit between the finger f, and the plate C, is uninterrupted. When, however, this circuit is broken or interrupted by the linger f, coming in contact with the nonconducting ink on transmitting surface at A:, this local circuit is interrupted, s 2, moves to its back-stop and the current from the main battery 2kf, t?, will pass through the line u 1, switch U t, and over the main line to Y. When, after passing through the contacts and the switch U 1, it flows through the coils of R, and thence to earth. The armature r, of magnet R, is thereby drawn against its front stop, thereby breaking the circuit of the local battery L, B 1, which normally is completed through r, line s, switch U~ and magnet coil S ~. When the impulse sent from -32", breaks this circuit in the manner described, the armature of 5 2 , moves against its back-stop, thus completing the circuit of the local battery L, ]3, through the armature s 2, line ~,~, switch U 3, u2,f, and plate C. If, therefore, the surface of the receiving apparatus is covered with a sheet of Bain paper, a discoloration is produced thereon, which reproduces the design traced on the transmitting apparatus.
From this brief description of the apparatus which the author has drawn mainly from the United States Letters Patent before referred to, it will readily be seen that Mr. Delany has PrOduced a system of fac-simile telegraphy that possesses all the requisities for successful commercial application.