uestions, the least fact the poles of an electro-magnet, the currents that de- is, as well known, capable of giving rise to interest- velop therein will counteract the motion of the motor; ing researches and offering material for important and, since the reaction increases with the velocity, the… … distance between the magnet and the moon, and Jupiter, the only star that arc may be modified at will. projects an appreciable visible shadow, The electro-magnet is excited by two and, in astronomical treatises and re- PHOTOGRAPHY OF STAR SHADOWS. coils which are secured thereto and the views, we…
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