Transactions . Fig. (j )mbination of Circular Chisel-EdgedPole and Spherical Pole of Half-inchRadius. Pole-distance, 2 Combination of Circular Chisel-EdgedPole and Conical Pole of °. Pole-distance, 2 in. III INVESTIGATIONS OF MAGNETIC FIELDS. Fig. h Fig .

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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries