Davis's manual of magnetism : including galvanism, magnetism, electro-magnetism, electro-dynamics, magneto-electricity, and thermo-electricity . HELIACAL RING. in motion. The polarity of the helix bears so close aresemblance to that of a magnet, that it is usual to Fig. speak of it as magnetic, and to give the names ofnorth and south poles to the extremities of its axis. 274. In Fig. Ill are represented, at a a, twodouble cylinders of iron, enclosing a coil. A sec- Fig, 111.

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Keywords: ., bookcentury1800, bookdecade1850, booksubjectmagnetism, bookyear18