Merchant, F. W. (Francis Walter), 1855-1937, Chant, Clarence Augustus, 1865-1956 · Toronto : Copp Clark · leaf 311
in reading the illumination of the printed page shouldbe not less than 1 candle-foot (i.e., 1 candle at a distance of 1 f(Kjt). Howfar might one read from a 16 candle-power lamp and still have sufficientillumination ? 6. A candle and a gas-flame which is four times as strong are placed 6feet apart.… … 342. Roemers Great Discovery. Galileo constructed the telescope in. 1609 and tlie first fruit of its use was the discovery thatJupiter was attended by four moons. At present we know that theplanet has eight moons, but while the four first discovered can beseen with a small telescope, the last four…
Physics
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