The Receiving Apparatus.—The receiving station, on the other hand, has neither condenser, induction coil, nor key. When the apparatus is in operation, the coherer switch is closed, and the instant a current passes through the coherer and operates the telegraph sounder, the galvanometer indicates the current.
Of course, when the coherer switch is closed, the battery operates the decoherer
How the Circuits are Formed.—By referring again to Fig. [76], it will be seen that when the key is depressed, a circuit is formed from the battery through wire B to the primary coil, and back again to the battery through wire D. The secondary coil is thereby energized, and, when the full potential is reached, the current leaps across the gap formed between the two knobs (F, H), thereby setting up a disturbance in the ether which is transmitted through space in all directions.
It is this impulse, or disturbance, which is received by the coherer at the receiving station, and which is indicated by the telegraph sounder.