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 . 45 We know then that the hullet is in that plane. Now, inclinethe ring in some other direction and explore again. Letthe position of niaxiniuni sound he now C D. We knowthen that the hnllet is soniewliere on the straight line formedby the intersection of the planes A B and C 1). It is onlynecessary then to make a third observation with the appa-ratus so inclined that
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 . 45 We know then that the hullet is in that plane. Now, inclinethe ring in some other direction and explore again. Letthe position of niaxiniuni sound he now C D. We knowthen that the hnllet is soniewliere on the straight line formedby the intersection of the planes A B and C 1). It is onlynecessary then to make a third observation with the appa-ratus so inclined that the plane of the ring cuts this straightline, for instance, the position E F. The point of intersectionof the three planes G is then the exact point occupied hy theInillet. I shall conclude this paper l)y the description of an experi-ment miade in Newport, R. I., a few days ago. The resultsare so unprecedented in my experience that I feel they cannotl)e received as implicitly relial)le until the experiments havel)een repeated and veritied. J^ff 31 J^jruvy. I had arranged upon a talde three coils, (as shown in ) The lai-ge Hat primary coil A was connected with a l)at-tery of four Bunsen elements and an interinipter, as shown,and the two small secondaries of tine wire, B C, were con-nected with a telephone. The secondary B was moved about on the primary A untila position of silence was ol)tained. Upon hi-inging a leadenbullet near C the balance was disturbed and a distinct sound 46 prodnced from the telephone. Thei-e is nothing very strangeabout this when we know that the distance between A and Cwas only 15 centimetres, so that C was well within tlie field ofinduction of A; but what did seem extraordinary was that theapproach of the large steel Itlade of a peidcnife to the coil Cproduced no effect! Tlie iron diaphragm of a hand telephonebrought close up to the coil C produced no sensible disturb-ance of the balance, whereas a small disk of lead producedquite a marked effec
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