me of oxygen contained in the inclosed atmospheric known by the name of the "Kew magnetometer," and a converging lens of a focal length of about 1'10 m. In the air. The explosive mixture produced is, in fact, quite this, up to recent years, has been almost exclusively em- balance, this lens is… … thickness to 18 inches in diameter. Other drills, not tubu- * are sent to the sensitized paper. Fig. 2.-THE MAGNETIC REGISTER. Fig. 3 will give an idea of the lar, were used for small holes, arrangement. The reflected rays one measuring 1-& inches long that proceed from one of the side and Tfo of…
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