d bifilar the front aperture of the case contains the volume 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. Inthe air. The explosive mixture produced is, in fact, quite this, up to recent years,… … thickness to 18 inches in diameter. Other drills, not tubu- are sent to the sensitized paper. Fig. 3 willgive au idea of the lar, were used for small holes, arrangement. The reflected rays one measuring 1,8, inches long that proceed from one of the side and ;85 of an inch in diameter. But this is…
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