. Optical projection : a treatise on the use of the lantern in exhibition and scientific demonstration. emonstrated by projecting themovement of a galvanometer, which can be easily done invarious ways. MAGNETISM AND ELECTRICITY 40! Where great sensitiveness is not required, a perpendicularglass dial and multiplier coil arranged as in fig. 220, whichrepresents one constructed by Stohrer of Leipzig, will be far themost convenient and simple, needing only to be placed in frontof the condensers and care in balancing theneedle, this arrangement can bemade amply sensitive for allordina
. Optical projection : a treatise on the use of the lantern in exhibition and scientific demonstration. emonstrated by projecting themovement of a galvanometer, which can be easily done invarious ways. MAGNETISM AND ELECTRICITY 40! Where great sensitiveness is not required, a perpendicularglass dial and multiplier coil arranged as in fig. 220, whichrepresents one constructed by Stohrer of Leipzig, will be far themost convenient and simple, needing only to be placed in frontof the condensers and care in balancing theneedle, this arrangement can bemade amply sensitive for allordinary induction or directcurrent experiments, and alsoserves to illustrate the action ofthe needle telegraph. Another good galvanometerof this kind, shown in fig. 221,was constructed, and has beenused with success in many of hislectures to large audiences, byProf. S. P. Thompson. Here the coil a b c d is wound hori-zontally, and to the centre of the needle n s is attached, at rightangles, a very light perpendicular index or pointer, the needleand its pointer being so mounted that the centre of gravity. Fig. 220.—Lantern Galvanometer
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Keywords: ., bookauthorwrightle, bookcentury1900, bookdecade1900, bookyear1906
