steam wheel

The same as ROTARY STEAM ENGINE (q. v.). steam-whistle, s . 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, signal ing, . In the ordinary locomotive steam-whistle the foot is bolted onto the fire-box, has an opening (a) for the admisof steam, and is provided IMG:content-0251.jpg:[ocr errors] with a cock' (e), by turning which steam is permitted to rush into the hollow piece ( b ), which is provided with holes around its lower and narrower portion, through which the steam rushes into the cavity of the cup (c), and, pa ing out through the narrow annular opening, impinges against the rim of the bell ( d ), causing a shrill, piercing sound. Holes in the top of the bell permit the escape of the 7 18 2 steam upwardly and increase the volume of sound. 11 3 9 19 1839-Great Western, Liverpool to New York... 18 1845-Britannia, Liverpool to New York....... 14 1848-Europa, Liverpool to New York..... 1852-Baltic, Liverpool to New York..... 1864-Scotia, Queens town to New York. 1867-City of Paris, Queens town to New York... 8 3 11 1869-City of Bru els, New York to Queens town. 8 15 45 Steam-whistle. ste argillite The quality of the tone depends on the width of the annular opening, the depth of the bell, and the distance between it and the cup. The calliope (q. v.) is a series of such whistles tuned to a scale and operated by keys.