For the purpose of generating the galvanic fluid, they use the magneto electric machine. Their plan, being unwieldy and difficult to operate, is omitted, and in its stead, we introduce that form of it, invented by Dr. Page, which has already been described in figures 45, 46 and 47. There is also required for the purpose of making the desired deflections of the magnetic bar, a commutator, or pole changer, such as we have described in figures 48, 49 and 50. Figure 51 represents that portion of the apparatus at the _receiving_ station. The magneto electric machine, and the pole changer, properly connected, are the instruments of the _transmitting_ station. Two wires, or one wire and the ground, form the circuit between these two stations. The machine is put in operation by turning the crank, and the person sending the intelligence is stationed at the commutator, and directs the current through the extended wires to the multiplier of the receiving station, so as to deflect the bar to the right or left, in any succession he may choose, or suspend its action for any length of time.
“But in the apparatus for observation, the observer looks into the spy-glass, and writes up the kind and results of the variations of the magnetic needle. In order to have a control of the recorder, let there be a good number of spy-glasses directed towards the same mirror, in which observers may watch independently of each other. Suppose that five variations of the magnetic needle signifies a letter. L denotes a variation to the left, and R to the right. Then, might r r r r r denote A; r r r r l denote B; r r r l r denote C; r r l r r denote D; and so on. In the whole, we obtain, by the different arrangements of the five, which are made with the two letters, R and L, 32 different telegraphic signs, which may answer for letters and numbers, and of which we can select those where the most changes are introduced between _r_ and _l_, as the most common letters, in order, in the best possible manner, to notice the constant variations of the magnetic needle.”
The following would be the alphabetical signs, as arranged from the above directions:
A r r r r r | I or Y l l r l l | R r r r l l B r r r r l | K l r r r l | S or Z r r l r l C r r r l r | L r l r r r | T l l r l r D r r l r r | M r r l l l | U r l l l r E r l r l r | N l l l l l | V l r r l l F l r r r r | O l r l l l | W l l l l r G or J l r l r r | P l r l r l | H r l r r l | Q l l r r r |