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file U (Stack)Bennett, A.
"A new suspension of the Magnetic Needle, intended for the Discovery of minute quantities of magnetic attraction; also an Air vane of great Sensibility, with new Experiments on the Magnetism of Iron filings and Brass"
extract from Repertory of Arts and Manufactures, vol. XII, 1800, pp. 311-20 and 394-406.
[1978-556]
1800