Electrical Indicator Signal Adopted.
Geo. W. Petty, inventor of the electrical indicator signal, has erected one of his signals at King and St. Asaph streets Alexandria, Va., to protect the street-crossing against any accidents that may occur. The device is designed to prevent collision between fire apparatus, street cars and other vehicles. It is connected with the enginehouse in such a way that, just as the apparatus leaves the house to respond to a fire-alarm, a bell rings and a red paddle or semaphore arm drops at a right angle to the street, as a warning to cars and vehicles to keep out of the way, as the engine is coming. At night, in addition to the bell and paddle, red lights are shown as a further y arning. The machine works automatically, is not easily disarranged and weather conditions have no effect u on it. The inventor says he is greatly encouraged over his pros pective business, and many fire chiefs are interested in the practical value of his apparatus.