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 . heard. Thus the only difference would be instead of as usual taking themetallic body to the coils upon a fixed table, we take the coils to a fixed bodyin which we suppose metal, such as a bullet, to be hid. 53 Now, suppose we take the coils A and move it over a body with a bullet,thus:. If bullet near C, we should hear it when cdils just above it; at E, when thecoils
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 . heard. Thus the only difference would be instead of as usual taking themetallic body to the coils upon a fixed table, we take the coils to a fixed bodyin which we suppose metal, such as a bullet, to be hid. 53 Now, suppose we take the coils A and move it over a body with a bullet,thus:. If bullet near C, we should hear it when cdils just above it; at E, when thecoils were below; but if bullet in the centre of the body, then we should haveequal or probably no indications. All this could be most easily done and with some results if the bullet hadbeen of copper or silver, but lead has such a high resistance and gives, con-sequently, very feeble tones. We can easily hear a copper penny at some inches distant from the coils,but lead reqiiires that it should not be more than one or two inches distant,consecpiently, more sensitive coils would be required or a larger battery. I think the experiment a hopeful one, and above all that the coils are easilymade, and simple experiments could be first made to find a l)ullet in a mass ofcotton, &c. The microphone is invaluable as a prol,e for bullets. I made the first forSir Henry Thomson to find out stone in bladder. But it is even more applicableto bullets. It consists of a simple hammer and anvil microphone adjustedupon the h
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