WIRELESS FIRE ALARM

WIRELESS FIRE ALARM

M. E. Guarini, of Brussels, Belgium, is said to have devised a wireless automatic fire alarm telegraph, which will send in its own alarm when fire occurs within such distance as will heat the mercury thermometer to the operating point. Whenever the temperature round the thermometer rises above a certain degree, an electric circuit is closed, starting a clockwork mechanism which revolves a notched wheel. On the face of this revolving wheel is a brush, which, closes a circuit with a wireless telegraph sending apparatus. By properly spacing the notches on the face of the wheel, it is claimed that the opening and closing of the circuit through the medium of the brush will send out waves from the air wire of the transmitter, and. by varying the position of the notches, a definite signal may be sentsuch, for instance, as a number representing the building in which the alarm has been located. If it were possible to use this telegraph apparatus in connection with a series of thermostats, located in different parts of the building, the invention might prove invaluable, as the fire station would automatically receive notice of a fire and be able to respond, without depending on some one chancing to see the fire and turning in an alarm.

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