Issue 15 and Volume 19.

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…

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