Well's natural philosophy : for the use of schools, academies and privte students, introducing the latest results of scientific discovery and research ; arranged with special reference to the practical application of physical science to the arts and the experiences of everyday life ; with three hundred and seventy-five engravings (1873)
Wells, David A · New York : Ivison, Blakeman, Taylor and Co. · leaf 439
ght, P, on the cord, C.This clock-work gives motion to two metal rollers, G and H, between whichthe ribbon of paper passes, and which, turning in opposite directions, drawthe paper from the cylinder B. The roller H has a groove around its circum-ference (not represented in the engraving), above… … The manner in which intelligence is commimicated by these arrangementsIs as follows: The pieces of soft iron, F and E, being rendered magnetic bythe passage of a current of electricity transmitted from the battery through thecoils of wire sun-ounding them, attract the metal arm D of the lever A.…
Physics · Science · Technology
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