The outlines of physics: an elementary text-book (1897)
Nichols, E. L. (Edward Leamington), 1854-1937 · New York, The Macmillan Company; London, Macmillan & Co., Ltd. · leaf 240
tion, andthose in which elec-trostatic induction ismade use of. The for-mer are calledfrietionalmachines, the latter in-fluence machines. The earliest form offrictional machines con-sisted simply of a ballor cylinder of glassmounted upon a hori-zontal axis, so that itcould be given a rapidmotion of… … Fig. 179. I t n226 THE OUTLINES OF PHYSICS In later machines glass disks were substituted for thespheres and cylinders, and a rubber consisting of silk orof undressed leather was used instead of the hand. Itwas soon found that an application of an amalga;m ofsodium to the leather greatly enhanced…
Physics
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