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Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)

Johnson, Frank G., 1835- · Chicago, A.H. Andrews · leaf 416

An illustration from Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families, 1878, leaf 416
—The thermo-electric revolving arch.—A delicatereaction between the magnetism of theeartli and the electric current may be hadby this instrument. The arch is a pieceof brass wire, nicely adjusted on a pivot atthe top of the support, having its two endsconnected to German silver wire, HS,… … 410 ELECTRICITY. man silver, tbrougli the heated junction to the brass and through thearch to the German silver. The faces of the arch thus acquire polarity,the face turned to the north exhibiting south polarity. The arch,therefore, will move round to present its other face to this pole; but,in so…

Physics · Astronomy

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