FIG. 51.—
SAWYER-MAN
LAMP.
FIG. 52.—EDISON’S ELECTRIC LAMP.
A—Exhausted globe. B—Carbon filament. CC—Wires sealed in glass. D—Line of fusion of two parts of globe. EF—Insulating material. G—Screw-threads. HI—Metal socket. J—Fixture arm K—Circuit controlling key.
In the early demonstration given by Edison great disturbance was caused in the stock exchanges among the holders of gas shares, as the sensational reportings in the press seemed to indicate that gas was to be superseded entirely. This uneasiness on the London Stock Exchange amounted on October 11, 1878, to a veritable panic, but while the electric light has more than fulfilled the prophecy made for it in many directions, gas shares still continue to be good stocks.
FIG. 53.—ELECTRIC LIGHT CIRCUIT.