Small, Sidney Aylmer, 1876- [from old catalog] · Chicago, F. J. Drake & co · leaf 173
of this fact by putting an ex-tra hunting case of soft iron on a watch to screen it fromthe magnetism of electrical machinery. (2) Measuring instruments used on switchboards ornear dynamos are enclosed in heavy cast-iron cases. 174 ELEMENTARY. ELECTRICITY (3) Galvanometers are sometimes surrounded… … Pig. 88. Needle Screened from ActionBody. ~*i> Earth tS.Pole of a Magnet by a Magnetic Answer. They are used in the receivers of tele-phones; in magneto bells for telephone calling and gen-eral signalling; in the magnetos used for ignition pur-.poses in gas, gasolene and oil engines; as magnets…
Electricity
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