Improvements in electro-magnetic apparatus adapted to the generation of electric currents for exercising and other hygienic purposes.

  • Allison, John Herbert
Date:
1884
Catalogue details

Licence: Public Domain Mark

Credit: Improvements in electro-magnetic apparatus adapted to the generation of electric currents for exercising and other hygienic purposes. Source: Wellcome Collection.

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    Specification. Allison’s Improvements in Electro-magnetic Apparatus, &c. Within a central, longitudinal, cylindrical chamber formed in the dumb-bell, A1, is Htted an induction coil, E, constructed in the customary manner, of a primary coil of insulated wire, b, wound about a central core and overlapped by an outer, secondary coil of finer insulated wire, c. An insulating coating or envelope is laid upon the outer coil, and upon this is fitted a cylindrical metallic case or damper, F, 5 of about the same length as the coil and which is adapted to be slid off and on the same within the cylindrical chamber by means of a pin or button, F1, projecting from the slide outward through an extended slot in the casing, its too free move¬ ment being prevented by a lateral spring, e, interposed between it and the inner side of the containing chamber. The slide or damper is supported, as it moves off 10 from the coil, by means of a cylindrical block, /, whose diameter coincides with that of the coil so as to serve, when fitted end to end thereto, as an extension thereof, as illustrated in Figure 3. The outer end of this block, /, rests against a partition which separates the central chamber in which the induction coil, E, and its slide or damper are thus fitted from a semi-spherical recess in the end of the 15 dumb-bell adapted to contain the battery-cell, G. A flat, helical spring, g, is fitted in the bottom of the recess, and the bottom of the cell, G, carrying the metallic contact plate of one of its poles, is made to rest upon the spring, which is connected with the inner end of the primary coil, b, of the inductorium by means of con¬ ducting wire, b\ led through a slot cut in the iuterposed block, /. The opposite 20 end of the chamber containing the inductorium is closed by a metallic plate, H, fixed over the same and made fast to the end-block, h, of the induction coil, through which the outer end of the primary coil, b, together with the inner end of the secondary coil, c, are led into contact with said plate, H. The end of the central core, a, of the induction coil is extended out through the 25 plate, H, to attract a vibrating armature opposed thereto and consisting of a spring-plate, J, made fast at one end to the plate, H, so that its opposite, free end, carrying a suitable platina contact point, may vibrate in and out of contact with the end of said core, a. The vibrations of the spring armature, J, are limited and regulated at pleasure by means of an arm or lever, K, pivoted to an insulated 30 block, K1, on the plate, H, so as to swing transversely over the armature to bear thereon, more or less closely to its outer end. Manual contact plates, B1 B2, are fitted and secured upon opposite sides of the body of the dumb-bell and are both connected by conducting wires with its battery-cell, one of them, B1, being also connected with the lever, K, over the vibrating armature, J, by means of a pin or screw led through the insulating block, K1, and to the end of which the conducting wire, %, is connected. A simple, sliding, circuit-closing device L, is interposed between the end of the wire, i, and the manual contact plate, B1. The outer en of the secondary coil, c, is connected by a fine wire with an outer bindinof screw, C2. — - ° T^e ends of the dumb-bell are closed by semi-spherical, hollow caps, M M1, each ntted thereto by a bayonet-joint which is constructed of a metallic ring, JST fitted as a band upon the end of the body of the dumb-bell and which is formed with suitable slots, k, k, at opposite points, to receive and interlock with pins on the inner face or rim of each cap, M. The cap is made to fit snugly over and upon said band and to make a neat close joint with the body of the dumb-bell, as illustrated in Figure 2. ' The battery-cell, G, is preferably of a spherical bottle-shape to fit snugly within he sphermal end of the dumb-bell. One element of the cell is made t/connecf other eh.™ bottomthereof Wlth the spring-plate, g, and the primary coil; the 50 bind mlTr 1 p'nadt‘t0 connf°t ou*wardly through the stopper of the cell with a 111 the cfP> M -governing and closing that end of the dumb-bell, the ‘ „t!ir’ • ’ ^ oouuected by a concealed conducting wire, with the pin engaging vheTt w?tb’t?’and T* T “ ,iu turn coated by concealed conducing wnes, n n, with the manual contact plates, B1 and B2, -- 5jj 35 40