Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
677. Figure 14.—The cylinder electrical machine.—Toobtain larger (piantities of electricity than can be supplied by means 362 ELECTRICITY. already described, machines of various sizes and forms are made. How-ever these may differ, there are at least three essential parts, viz.: 1st, anon-conductor,…
Physics · Astronomy
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