Siren Installed in Portland Plant

Siren Installed in Portland Plant

(From Our Regular Correspondent)

The Northwest Steel Company, of Portland, Ore., has installed an electric Federal siren to be used as a fire whistle, the first of its type to be used in this locality. Sound from this siren will carry three-fourths of a mile, and can be augmented, if desired, to carry two miles, in either case depending upon wind, weather and surroundings. It is operated by a two horsepower electric motor, is 24 inches in length, 12 inches in diameter at the throat and weighs 200 pounds. In construction it is one cylinder inside a larger, each having 4×1 inch square slots cut through, which produce sound when revolved at 1,800 r. p. m. The siren does not necessarily produce the loudest sound, but gives a peculiar tone, graduating up and down the scale, making an effective alarm. It is operated by the use of a make-and-break knife switch from the compressor engine room. The number of the station sending in an alarm is indicated by reducing and augmenting the sound, allowing five seconds between notes.

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