OCR Text |
Show Heat of the Moon. A problem of great interest in physics and astronomy, on which Tyndall, Lord Moose and Professor Larigley labored iu vain, has been solved, and trustworthy evidence at last boon obtained as to the thermal value of moonlight. This has been accomplished by Mr. C. V. Boys, one of the professors at South Kensington, Kensing-ton, who, by means of his quartz filaments fila-ments has produced a thermopile of almost al-most incredible dolicacy. By this apparatus ap-paratus he can render sensible the heat of a candle up to the distance of a mile and three-quarters, and by directing the minute disk of the instrument to tho moon he has shown that the warmth re-ceived re-ceived from its reflected light is equal to that given out by a candle at twenty-one feet distance. The result accords with the anticipations of Professor Piazzi Smyth. Observations seems to show that, although the moon's face is under the blaze of an unclouded sun for fourteen days, it remains comparatively cool, and that whatever heating it does ultimately receive is rapidly gained and as rapidly lost. London Standard. |