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 386
rass, theleaves will instantly diverge. The bestelectrometers are carefully insulated so thatthe electricity communicated to the balls orleaves may not be too soon dissipated. Electroscopes merely indicatethe presence of an electrically excited body : they do notmeasure the quantity, either… … What is anElectrometer ? 382 WELLSS NATURAL PHILOSOPHY. Fig. 320. consists of a semicircle of varnished paper, or ivory, fixed upon a verticalrod. From the center of the semicircle a light pith-ball is suspended, andthe number of degrees through which the ball is attracted or repelled by anybody…
Physics · Science · Technology
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