. Calcutta Journal of Natural History. Electricity and Galvanism. 257 quantity and intensity of the inductive electricity, together with the additional recommendation of low A. The wooden bobbin, on which is wound the double coil of wires. B. C. The screws connected with the ends of the fine coil, with conductors affixed. D. The apparatus for breaking battery contact. E. Single pair of plates (Smee's arrangement) connected with the screws, F. G. This consists of a wooden bobbin, with a hollow axis. About thirty feet of thick insulated copper wire are wound on it, and over this about a
. Calcutta Journal of Natural History. Electricity and Galvanism. 257 quantity and intensity of the inductive electricity, together with the additional recommendation of low A. The wooden bobbin, on which is wound the double coil of wires. B. C. The screws connected with the ends of the fine coil, with conductors affixed. D. The apparatus for breaking battery contact. E. Single pair of plates (Smee's arrangement) connected with the screws, F. G. This consists of a wooden bobbin, with a hollow axis. About thirty feet of thick insulated copper wire are wound on it, and over this about a thousand feet of very fine insulated copper wire, the ends of which are soldered to a couple of binding screws fixed in the base of the instrument: the former is the coil in which the initial or inducing current is intended to circulate ; the latter is the secondary coil, where electricity is to be disturbed and thrown into motion, to form the induced current. One of the ends of the primary thinner coil is connected with the zinc plate of a single battery ; the other end of the wire surrounds a small horseshoe of soft iron, and is then soldered to the lower end of a bent rod of brass, whose upper end carries a small screw furnished with a platinum point, which presses on a plate of the same metal fixed to a transverse bar of thin brass, having at the end suspended over the poles of the horseshoe a disk of soft iron. When the fixed end of this bar is connected with the copper or silver plate of the little battery, the disk of iron is rapidly attracted by the ends of the horseshoe, which acquire a powerful magnetic force. In an instant, the contact between the platinum wire and plate being broken, the current is arrested, and, the horseshoe losing its magnetism, the elasticity of the brass bars 2 L. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not p
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