Improved construction of plates and arrangement of fastenings for connecting them in voltaic order for medico electric purposes / [William George Johnson].

  • Johnson, William George.
Date:
1888
Catalogue details

Licence: Public Domain Mark

Credit: Improved construction of plates and arrangement of fastenings for connecting them in voltaic order for medico electric purposes / [William George Johnson]. Source: Wellcome Collection.

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    Johnson’s Improved Construction of Plates, fc. for Medico Electric Purposes. terminal by the copper coil of the copper plate A at the opposite end of the chain or and. lliese terminals I. J, have holes in them for the connection of tape to fix them to any part of the person. If the plates of the band Figure 2 be exposed as indicated each element plays its own part for distributing the current but if said band be covered by a fabric the erminals alone are applied to the part of the person affected in a concentrated form or what is termed a current of intensity. Figure o represents a modified copper plate A in which the cords D may be ispensed with and yet be connected to the pole plate of the adjoining element as represented in the example Figure 6 where two elements are joined. This method of connection is by constructing the copper plate A with two projections K and the zinc element with two projections L, these being somewhat larger and slotted for the projection K to be passed into and curled round in hook form for linking the copper l K °ne e^emen^ z^nc the other the projections L, L, being first passed through to slots P of the copper plate as shown. The copper plates are flat and instead of being folded vertically as indicated in the Figures already referred to they may be folded horizontally as at Figure 7 and instead of the zinc of each element being coated or have thread wrapped upon them, ~ C0PPer P^e may be so coated as to protect it from the zinc, the fold over portions being compressed for clamping the cords D, whereby the chain or band is of a flexible character as described with reference to Figure 2. The copper plates which are flat may be composed of what is known as ribbon copper and this ribbon may be folded as indicated after being coated or protected by a thread so that the zinc, which may be of flat or round form, is arranged between each fold of the copper and according to the sizes of each element so the number of folds would be increased or diminished to correspond, their connection in voltaic order being secured by compression at the joints as will be understood. I have not shown a complete band in Figure 7, but terminals of any desired shape, similar to I. J, can be voltaicly connected for making up a band of any 30 desired length. ' J < The rectangular slots or spaces in the copper plates or between the copper and the zinc admits of the desired depolarization. I have referred to rectangular slots in the plate A but other shapes of slots or apertures may be readily formed by stamping to permit of the free entrance of the 35 exciting fluid to the threads whether the band or chain be covered with flannel or other porous material or the elements are left exposed. I am aware that copper and zinc plates have been stamped and arranged as elements and connected in voltaic order, the exciting fluid having free access to threads, laced or covered, which also prevent the touching of the two plates forming TO the element and I am also aware that elements have connected by flexible cords therefore I make no claim to the combination of such plates and cords in a general or broad sense but Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed I declare that what T5 I claim is The particular construction or formation of copper and zinc plates shown on the annexed drawings and the method or methods of connecting them voltaicly to produce a chain or band for Medico Electric purposes as set forth. The 16th day of July 1888. 50 H. GARDNER, 166, Fleet Street, London, Agent for the said W. G. Johnson. LONDON : Printed for Her Majesty’s Stationery Office, QflrS^ By Darling and Son, Ltd. 1888. library 1
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