St. John, Thomas M. (Thomas Matthew), b. 1865 · New York, T. M. St. John · leaf 13
mple,that generated with glassand silk is not the sameas that made with eboniteand flannel. It has beenagreed to call that pro-duced by glass and silkpositive, and that byebonite and flannel nega-tive. The signs + and — are used for positive andnegative. 7. Laws of Electrification, (i) Charges of… … Fig. 4. ABOUT FRICTIONAL EI,ECTRICITY. II static eledtricity in quantities for experiments, somedevice is necessarj. The dcB^ophorus (e-lec-tropli-o-rus) is about the sim-plest form of machine. Fig. 5 shows a simple elecSroph-orus in which are two insulators and one condudtor.The ebonite sheet E S…
Electricity
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