Steam Whistle
a sounding device connected with the boiler of a steam engine, either stationary, locomotive, or marine, for the purpose of announcing the hours of work, signaling, etc. In the ordinary locomotive steam whistle the foot is bolted onto the fire box, has an opening for the admission of steam, and is provided with a cock, by turning which steam is permitted to rush into the hollow piece, which is provided with holes around its lower and narrower portion, through which the steam rushes into the cavity of the cup, and, passing out through the narrow annular opening, impinges against the rim of the bell, causing a shrill, piercing sound. The calliope is a series of such whistles tuned to a scale and operated by keys.
STEAM WINCH wax.
STEEL