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 . erea1)le, with the aid of a rotating comnnitator, ttion themore distinct was the soundin the telephone. Thehearing distance, however,was not proportionatelyincreased. The automaticinterrupter, (shown in ,) yielding al>out lOO iu-terrupti(jns per s e c o n d ,gave as o-ood results as any,and was nmch more conve-nient. This interrupterwas therefoi-e afterwardsus
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 . erea1)le, with the aid of a rotating comnnitator, ttion themore distinct was the soundin the telephone. Thehearing distance, however,was not proportionatelyincreased. The automaticinterrupter, (shown in ,) yielding al>out lOO iu-terrupti(jns per s e c o n d ,gave as o-ood results as any,and was nmch more conve-nient. This interrupterwas therefoi-e afterwardsused exclusively in our ex-periments. The theoretical form of coil suggested by Pj-of. John Trow-bridge? was sul)stantially the same as that proposed by ,- and is shown in Fig. G. The arrangement was quite sensitive to metal placed in the 1 Mr. Sumner Tainter has since made an apparatus operating in a similarmanner by means of which he has obtained as many as 4,000 interrixptions ofthe circuit per second. ^See Appendix, note G. ° See Apjjendix, note 10 mtei-i<)r of the coil, hut the hearing distance for a hiiUet exter-nal to the coils was no greater than l»eforeJ I
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Keywords: ., bookauthoryapamphl, bookcentury1800, bookdecade1880, bookyear1882
