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After a galvanometer deflection has been obtained through the expansion or contraction of the strip by reason of a change of temperature, a similar deflection is obtained mechanically by turning the screw, S, one way or the other. This causes the vulcanite strip to press more or less upon the carbon button, and thus produces the desired change in the resistance of the circuit.
A device for lighting gas by the electric spark is shown in figure 95, where A is a flat vulcanite box, containing the apparatus which generates the electricity, and a stem or pointer L, which applies the spark to the gas jet. The generator consists of a small "influence" machine, which is started by pressing the thumb- key C on the side of the box.
Three superb glass jars red, green, and blue of the sort that led Rosamund to parting with her shoes blazed in the broad plate-glass windows, and there was a confused smell of orris, Kodak films, vulcanite, tooth-powder, sachets, and almond- cream in the air. Mr. Shaynor fed the dispensary stove, and we sucked cayenne-pepper jujubes and menthol lozenges.
The long straps used in working machines are also made of gutta-percha, and this is another instance where its non-elasticity gives it the preference over India-rubber." "And what is vulcanite?" asked Clara. "It is caoutchouc mixed with sulphur.
This latter and the metal plate are connected in an electric circuit which includes a battery and a sensitive galvanometer. A vulcanite or other strip is easily affected by differences of temperature, expanding and contracting by reason of the minutest changes.
Constans had seen its like pictured in his books, and he instantly conjectured it to be an electrical switch-board, designed to control and direct the current generated by the dynamo. On the opposite wall was suspended a thick sheet of some insulating substance vulcanite and fixed upon it was a net-work of wires in whose outlines he could distinguish the lineaments of the fiery face.
Got him under the left ear-hole, Gabriel ! See him, see him, Michael? That hopeful blue devil! Land him one! Biff on your bottom, you hoper. But I wish the Arabs wouldn't entice me, or you, dear reader, provoke me to this. I feel with you, dear reader, as I do with a deaf-man when he pushes his vulcanite ear, his listening machine, towards my mouth.
The false impression is thus produced that the original radiated heat was unaffected by the vulcanite plate; instead of which, as a matter of fact, the vulcanite plate had cut off the radiant heat, becoming heated itself by so doing, and was consequently then the radiating body affecting the thermometer. The effect is similar in the case of induction between the two spirals.
But he could see more. These twinklings and reflections and re-reflections did not change their position; but there was one gleam that had motion. It was fainter than the rest, and it moved up and down through the air. It was the reflection of the candle on Oleron's black vulcanite comb, and each of its downward movements was accompanied by a silky and crackling rustle.
"Whew!" said Corks, stiffening up to get all the tickle of the big vulcanite scraper. "If we were playing pony for pony, we would bend those Archangels double in half an hour. But they'll bring up fresh ones and fresh ones and fresh ones after that you see." "Who cares?" said Polaris. "We've drawn first blood. Is my hock swelling?" "Looks puffy," said Corks. "You must have had rather a wipe.
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