Cynthia looped the coils of the telephone cord around her finger.
The leathery coils of its shiny body lay in a heap, stacked at least three tiers high.
The galvanometer being so adjusted that a current of definite strength through one of the coils gives a definite deflection of the needle, the amount of leakage expressed in terms of the insulation resistance of the wires is given by the formula.
The coils are wound with copper wire (covered with silk), 10 mils.
The current then passes through the coils of an electromagnet, which releases the printing mechanism.
The shafts are turned by the pull of the magnet upon the coils, and the motions of the transmitting pencil are thus reproduced.
In series with the tube is placed a single voltaic cell and a telegraphic relay, and Marconi added certain coils placed across the spark contacts of the relay to prevent the local sparks affecting the coherer.
The introduction of inductance coils into such circuits renders them more susceptible to trouble from atmospheric electricity and more sensitive to leakage variations.
Attempts have been made to improve submarine cables in this respect, and in 1906 a short cable " loaded " with Pupin coils was laid across Lake Constance.
The problem, however, of constructing a deep-sea cable satisfactorily, with suitable inductance coils inserted at short distances apart, is a difficult one, and one which it cannot be said has been solved.
If a current is passed through the fixed coil and movable coil in series with one another, the movable coil tends to displace itself so as to bring the axes of the coils, which are normally at right angles, more into the same direction.
In these circumstances the torsional angle becomes a measure of the torque and therefore of the product of the strengths of the currents in the two coils, that is to say, of the square of the strength of the current passing through the two coils if they are joined up in series.
Above and below these movable coils, which form as it were the two scalepans of a balance, are fixed other stationary coils, and the connexions of all these six coils (shown in fig.
6) are such that when a current is passed through the whole of the coils in series, forces of attraction and repulsion are brought into existence which tend to force one movable coil upwards and the other movable coil downwards.
While I was there, General Loring himself came in, and showed me some of the most beautiful statues, among which were the Venus of Medici, the Minerva of the Parthenon, Diana, in her hunting costume, with her hand on the quiver and a doe by her side, and the unfortunate Laocoon and his two little sons, struggling in the fearful coils of two huge serpents, and stretching their arms to the skies with heart-rending cries.