Andrews, Ernest John, 1863-, Howland, Howard Newell, 1865- joint author · New York, London, The Macmillan company · leaf 266
Fig. 155. §§ 396-397] INDUCED CURRENTS 249 … Fig. 150. been made by Professor Crookes, and Fig. 150 shows oneof the forms of glass tubes devised by himfor this purpose. The rarefaction of airobtained in these tubes is such that onlyabout one-millionth of an atmosphere re-mains. When a spark discharge from aninduction coil, or from a…
Physics
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