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)
rubber is sometimes mounted upon an insulatedconductor, for the purpose ofdeveloping negative electricity.The air inclosed in the cylin-der should be free of moisture.The arrow, S, represents thedirection in Avhich the cylinderis turned, and the floAV of thefluid, which takes place, ofcourse, under… … ELECTRICITY. 363 culiir plate of glass is substituted for the cylinder, and is usually fur-nished with four rubbers, two of which, TT, are shown, held in suitabletightening clamps. The plate is revolved between these rubbers byturning the winch. Extending from the rubbers are silk aprons, SS;/■/are…
Physics · Astronomy
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