The young folk's cyclopædia of games and sports ; (1899)
Champlin, John Denison, 1834-1915, Bostwick, Arthur Elmore, 1860-1942, joint author · New York, H. Holt and company · leaf 580
, letting thesound through instead of reflectingit to the listener. 2. Let one person sound thetrumpet at one end of the room,while another, standing at the op-posite end, holds a common palm-leaf fan before his ear. When thejfan is slowly twirled by the handle,a change in the sound is heard,… … Sound Mirrors. Place the ear at e, in front ofanother concave mirror, r^ placedat some distance. It will be foundthat the ticking is heard more dis-tinctly there than elsewhere. Thesound is reflected in the directionshown by the dotted lines and ar-rows. The point c is the centre ofthe sphere of…
Games · Sports · Card games
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