Tyndall, John, 1820-1893 · London : Longmans, Green · leaf 316
o the reader ; while the Map, fig. 155,will furnish him with information as to the position ofmost of the localities referred to in the paper. On May 19 the instruments tested were :— On the top of the cliff: (a) Two brass trumpets or horns, 11 feet 2 inches long,2 inches in diameter at the… … 294 LECTURE VII. (5) A whistle, shaped like that of a locomotive, 6 inchesin diameter, also sounded by air of 18 lbs. pressure. (c) A steam-whistle, 12 inches in diameter, attached toa boiler, and sounded by steam of 64 lbs. pressure. At the bottom of the cliff: i^d) Two trumpets or horns, of the…
Sound
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