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 . rom Mr. Preece enclosing letter from Prof. Hughes. Genekal Post Office, London, England, 19 July, Dear Bell : The enclosed very interesting letter from Hughes willenable you to make some experiments, which I trust will result in , sincerely, W. H. Alexander Graham Bell, Waahingto/i, D. C (d.) Prof. Hughes to Mr. Preece. 108 Gt. Portl
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 . rom Mr. Preece enclosing letter from Prof. Hughes. Genekal Post Office, London, England, 19 July, Dear Bell : The enclosed very interesting letter from Hughes willenable you to make some experiments, which I trust will result in , sincerely, W. H. Alexander Graham Bell, Waahingto/i, D. C (d.) Prof. Hughes to Mr. Preece. 108 Gt. Portland street, W. London, July 18th, 1881. Dear Preece : In reply to yours of to-day enclosing telegram from ProfGraham Bell, I believe a specially-constructed Induction Balance could bemade to locate the leaden bullet in President Gartield, provided the ball wasnearer to one side of his body than the other. Suppose we have two flat superposed coils on a single reel, so that these twocoils form a single one as regard their relative distance ; these coils, if con-nected with the usual adjusting coils of my balance, could be reduced tosilence; then, on moving these coils near a metallic body, sounds would be Jlattery Secondary. 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:
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