Improvements in electro-magnetic apparatus to be used for curative and remedial purposes.

  • Chislett, Joseph Ralph
Date:
1886
Catalogue details

Licence: Public Domain Mark

Credit: Improvements in electro-magnetic apparatus to be used for curative and remedial purposes. Source: Wellcome Collection.

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    Date of Application, 26th Mar., 1886. Complete Left, 24th Dec., 1886. Complete Accepted, 22nd Feb., 1887. A. D. ] 886, i6th March. N° 4280. AAAA/^ aa a aa aa a aaaa a>va A A PROVISIONAL SPECIFICATION, Improvements in Eleotro^mag-netic Apparatus to be Used for Curative and Remedial Purposes. I, Joseph Ralph (Jhislett, of No. 35, Union Street, Plymouth in the County of Devon, Machinist, do hereby declare the nature of this invention to be as follows :— This invention relates to improvements in the construction of an electro-magnetic apparatus similar to that described in the specification of Letters Patent granted to 5 me and dated the 8th of January 1873, No. 87, the principle objects of such improve¬ ments being to facilitate the regulation of the action of the apparatus and to reduce the noise caused by the vibration of the armature in front of the poles of the horse¬ shoe magnet. Hitherto in electro-magnetic apparatus in which the intensity of the current has been 10 controlled by the movement of a core, consisting of a bundle of soft iron wires, within the coil, considerable inconvenience has been experienced owing to the difficulty of regulating the speed, or extent, of the movement of the core, and in order to over¬ come this disadvantage I arrange, longitudinally along the surface of the core a rack the teeth of which gear into a toothed wheel mounted in suitable- bearings in front of 15 the coil, and on the axle of the said toothed wheel I mount a thumb screw or other suitable contrivance by means of which the wheel can be rotated at such a rate that the core is caused to travel almost imperceptibly thus avoiding the objectionable jerks or shocks to which electro-magnetic machines, as ordinarily constructed, are so liable. The core hereinbefore mentioned is constructed of soft iron wires, in the following 20 manner. A skeleton tube or cage is formed of fiat wires, and the rack hereinbefore mentioned may be formed on the face of one of such wires, and the centre of the tube or cage is filled with wires, the ends of the core so formed being provided with suitable caps. In electro-magnetic machines at present used for remedial or curative purposes the 25 nerves of the person under treatment are likely to be unfavourably effected by the noise occasioned by the vibration of the armature of the magnet, and to avoid the occurrence of such noise 1 sink into the surface of the inner side of that pole of the magnet to which the armature is attached a buffer of india rubber or other [Price 8c/.]