The London, Edinburgh and Dublin philosophical magazine and journal of science . lie 436 Mr. A. P. Wills on the Susceptibility of. The bevelled faces are on angles of 60 degrees. When inposition the pole faces are parallel, and the gap betweenthem is about 1*5 centim. The figures given on the diagram represent centimetres. Fig. 4. >

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Keywords: ., bookcentury1800, bookdecade1840, booksubjectscience, bookyear1840