Upon the electrical experiments to determine the location of the bullet in the body of the late President Garfield; and upon a successful form of induction balance for the painless detection of metallic masses in the human body . 92 Further to Improve. Apparatus. Our attention had hitherto Ueen directed ehietlj to niodili-cations of the explorin<^ instrument. We n(»w investigated theeffect, upon the hearing (hstance, of the coils used to obtain al)alance. The following experiments, made July 29, 1881, hear upon the point: Fig. Exp. 1. (See Fig. 14.) Resistance of primary A
Upon the electrical experiments to determine the location of the bullet in the body of the late President Garfield; and upon a successful form of induction balance for the painless detection of metallic masses in the human body . 92 Further to Improve. Apparatus. Our attention had hitherto Ueen directed ehietlj to niodili-cations of the explorin<^ instrument. We n(»w investigated theeffect, upon the hearing (hstance, of the coils used to obtain al)alance. The following experiments, made July 29, 1881, hear upon the point: Fig. Exp. 1. (See Fig. 14.) Resistance of primary A of ex-ploring instrument, 2 ohms; resistance of primary C of bal-ancing coils, also 2 ohms; resistance of exploring secondary B,140 ohms; and of balancing secondary D, 120 ohms. Result: Hearing distance of bullet from explorer A B, Hearing distance from Italancing coils C D, also cm. Exp. 2. (See Fig. 15.) Same exploring coils as in Exp. 1,but balancing coils consisted of a flat primary, E—resistance, ohms; and flat secondary, F—resistance, 83 ohms. Theadjustment was made by sliding the se(;ondary coil upon theprimary until a position of silence was obtained. Result: Hearing distance from explorer A B, cm. Hear-ing distance from E F, 3 cm. As a general result of our experiments we found that vceru 23 hicre((se nt tJie iei<((nce of the IxdancuKj coils {esjMcially thepiuiiiory) rediK&I the hedihxj (Ihtance of the )lorh}(j i/tdru-
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Keywords: ., bookauthoryapamphl, bookcentury1800, bookdecade1880, bookyear1882
