Our boys; what they can do and how to do it (1893)
Stoddart, William, [from old catalog] comp · New York, Hunt & Eaton; Cincinnati, Cranston & Curts · leaf 191
smoke leaves a gun, or a flash of lightning illuminesthe sky, and the second when the sound produced reaches theear. From this you can easily calculate the distance of eitherobject, for we know that sound travels one thousand and ninetyfeet a second. A ray of light would go round our earth… … Fig I.—Sonometer or monochord. to the other. Fasten on one end a wedge-shaped stick andplace a movable stick of the same kind at the other end.Fasten a string or fine piano wire to the nail, lead it over thebridges and wheel, and attach to the other end some kind of 1 OUR BOYS. 187 weight; a small…
Handicraft · Amusements · Sports
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