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Through bruised lids he regarded the soot-masked intruder a nihilist, no doubt! His excellency had had one or two experiences with members of secret societies in the past. There was a nest of them in New Jersey. Though how one of them could have managed to get aboard the Nevski, he had no time just then to figure out. The nobleman looked over his shoulder toward a press-button.
The action of the contact key will be understood from figure 84, where P is the press-button removed to show the underlying mechanism, which is merely a metal spring A over a metal plate B. The spring is connected by wire to a pole of the battery, and the plate to a terminal or binding screw of the bell, or vice versa.
B is a small battery, say two or three "dry" or Leclanche cells, joined by insulated wire to P, a press-button or contact key, and G an electromagnetic gong or bell. On pressing the button P, a spring contact is made, and the current flowing through the circuit strikes the bell.
An outbreak of fire can be announced by causing the undue rise of temperature to melt a piece of tallow or fusible metal, and thus release a weight, which tails on a press-button, and closes the circuit of an electric bell. Or, the rising temperature may expand the mercury in a tube like that of a thermometer until it connects two platinum wires fused through the glass and in circuit with a bell.
This was quite a different affair. He now stood on guard with the knife poised and his left hand outspread ready to snatch at my stick. It was a much more effective plan; only he did not know that inside my stout malacca reposed a keen Toledo sword-blade. "I slipped my thumb on the press-button of the sword-stick and watched him.
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