These coils are drawn down, by the magnetic action of the field on the currents in the coils, into the annular spaces, against the pull of the springs, more or less strongly, according to the strengths of the two line currents.
Below this pendulum let there be placed another coil through which passes the current to be measured; then when currents pass through these coils the pendulum of the second clock will be either accelerated or retarded relatively to the other clock, since the action of gravity is supplemented by that of an electric attraction or repulsion between the coils.
The metal to be tested was prepared in the form of a ring, upon which were wound primary and secondary coils of copper wire insulated with asbestos.
Pupin showed that by placing inductance coils in circuit, at distances apart of less than half the length of the shortest component wave to be transmitted, a non-uniform conductor could be made approximately equal to a uniform conductor.
One of these coils is in series with the armature circuit and with the insulation or high resistance to be measured.
Mitted to the coils through an adjustable regulating valve, and by taking heat from the substance outside is evaporated, the vapour being continually drawn off by the compressor and discharged under increased pressure into the condenser.
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.
When the currents flow through the two coils, forces are brought into action compelling the coils to set their axes in the same direction, and these forces can be opposed by another torque due to the control of a spiral spring regulated by moving a torsion head on the instrument.
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 lines, of which, hardly an instant before, not one hand's breadth could have been gained, were now in long quick coils flung back all dripping into the boats, and soon the whale broke water within two ship's lengths of the hunters.