Tyndall, John, 1820-1893 · New York, D. Appleton · leaf 313
a candle, its rays would be collected, and sent back in acylinder of light. In the same manner the mirror collectsand reflects the calorific rays emitted by the ball b. Youcannot, of course, see the track of these obscure rays ; but isci. X. CONJUGATE JIIKRORS. 289 the galvanometer reveals the…
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