A text-book of physiology, for medical students and physicians . Fig. 42.—One form of the string-galvanometer : E, The electromagnet; b, the projectionmicroscope; F, a screw for varying the tension of the thread.—(Edelmanns Catalogue.) u. Fig. 43.— Schema i Bhow tin- relation f the thread to the magnets in the string-galvanometei l I, The delicate thread of silvered quartz or of platinum, stretched between11?? polai piece {PP) of an electromagnet, When a current passes through .1 A, the threadb movement. The ends of the magnets are pierced by holes, Been in /i, throughwhich the movements I the
A text-book of physiology, for medical students and physicians . Fig. 42.—One form of the string-galvanometer : E, The electromagnet; b, the projectionmicroscope; F, a screw for varying the tension of the thread.—(Edelmanns Catalogue.) u. Fig. 43.— Schema i Bhow tin- relation f the thread to the magnets in the string-galvanometei l I, The delicate thread of silvered quartz or of platinum, stretched between11?? polai piece {PP) of an electromagnet, When a current passes through .1 A, the threadb movement. The ends of the magnets are pierced by holes, Been in /i, throughwhich the movements I the thread may !><? watched by means of a microscope! or he pro-jected upon ,-i photographic plate. (After Einthoven.) metal poles of the magnel are pierced by boles, so that the thread may beilluminated by an eled ric light < Nernsl la nip) from one i ide, and on the otherthe Bhadow of the thread may be thrown upon a screen after being magnified by a microscope (see Fig. 42). With this arrangement the thread shows a ELECTRICAL PHENOMENA. 101 --3 lateral movement whenever a current is passed through it. The instrumentmay be made of great delicacy so as to detect very minute currents, and,moreover, it
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