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 . 38 On account of the small size and slight resistance of the bal-ancing coils we were enal)led to make the adjustable parts ofthe balancer of metal without practical interference witli thesensitiveness of tlie exploring instrument, and this gave ns thepower of making very delicate adjustments of the balancing-coils. We found it ad\isable, bowever, to avoid pl
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 . 38 On account of the small size and slight resistance of the bal-ancing coils we were enal)led to make the adjustable parts ofthe balancer of metal without practical interference witli thesensitiveness of tlie exploring instrument, and this gave ns thepower of making very delicate adjustments of the balancing-coils. We found it ad\isable, bowever, to avoid placing metal over thesensitive area of the coils as hadheen done in the instrument showniin Fig. 24. In the balancing apparatusshown in Fig. 25, (which is themost perfect one yet constructed,)rbe lever to which the upper coilis attacbed is made of hardrubber. In Fig. 26 is shown tlic most convenient form of case yetdevised for holding tlie exploiing coils. Bv invitation of Dr. Frank _^^^^ Hamilton experiments were made at his office in NewYork October 7,1881, the in-sti-uments used l)eing thoseshown in Figs. 22, 28, this was the first suc-cessful application of the Induction Balance to the discoveryof the situation of a
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