COMPRESSED AIR FIRE ALARM.
F. E. Whitney has invented a new fire alarm whistle which can be blown by compressed air instead of steam. By this new system the present expense attending the use of steam whistles will be entirely done away with; for the air-compressor is operated by water taken from the street mains. The air is compressed in two large tanks placed in the basement, and the machinery is run automatically. The pressure maintained is from 90 to 100 pounds, and this is quickly replaced when exhausted by the blowing of the whistle. The tanks can be made any size, according to the requirements of the whistle, and the number of blows to be given at each alarm. The three great advantages to be derived from the use of compressed air are a saving in expense, the non-requirement of an engineer to run the machinery, and the convenience to be derived from the location of the whistle at the most advantageous point in in the city, or town. To take Arlington. Mass , for example. Before the introduction of this system, the town paid $365 per year for steam to operate the whistle, while now it will cost practically nothing, and it is besides placed on the town hall in the centre of the town, while formerly located on a mill some distance away, where steam could be obtained. This whistle is an 8-inch chime, and the tone of it is as good as, if not better than it was, when operated by steam.