Appliances for generating an applying electricity : letters patent to Isac Louis Pulvermacher, of 194, Regent Street, in the county of Middlesex, England, electrical engineer, for the invention of "Improved apparatus or appliances connected with generating, conducting, measuring, or testing and applying electricity" : sealed the 23rd March 1877, and dated the 28th September 1876.
- Pulvermacher, Isac Louis
- Date:
- 1876
Licence: Public Domain Mark
Credit: Appliances for generating an applying electricity : letters patent to Isac Louis Pulvermacher, of 194, Regent Street, in the county of Middlesex, England, electrical engineer, for the invention of "Improved apparatus or appliances connected with generating, conducting, measuring, or testing and applying electricity" : sealed the 23rd March 1877, and dated the 28th September 1876. Source: Wellcome Collection.
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![k ——————— —— - — _ Pulvemiachers Impts. in Apparatus for Generating and Applying Electricity. This Invention relates to improvements in apparatus or appliances connected with generating, conducting, measuring, or testing and applying electricity, and consists in employing carbon vessels of a certain porosity and of various shapes, for instance, flat or cylindrical. In the hollow of these vessels I place a bar or hollow 5 cylinder of zinc in such a manner as to prevent a contact with the carbon vessel. The space between the zinc and the carbon vessel is filled with pulverized sal ammoniac or a substitution thereof of any other salt of an analogous action, which when slightly moistened with water, so as not to dissolve, excites the galvanic element thus formed. When the circle of such an element is closed an electric°current 10 of a constant action is produced by the atmospheric oxygen absorbed by the porous carbon vessel. The oxygen in presence of the sal ammoniac depolarises the carbon and thus secures a constant current. Such elements I use for making stationary as well as chain batteries, and I establish voltaic connections among such elements accordingly. ] 5 This first part of my Invention will be clearly understood by reference to the annexed Drawings, in which Figure 1 represents a few of my carbon cylinders with other fixtures, by which each serves as an element or part of a battery for the production of electricity to be conducted to any appliance with which it or they may be connected by conducting wires. • 20 a, a, are the cylinders, preferably of compressed pure or compounded carbon powder of round or of some other shape, open at both ends. One of these ends to form the bottom is closed in by a wad of gutta percha b, moulded and compressed therein to make it a fixture. The central part of the gutta percha wad has an aperture in it for the passage 25 and reception of the stem c of a bolt like pin, the head d of which abuts upon the inner surface of the gutta percha wad and without touching the carbon cylinder. The stem c projects through and beyond the outside of the gutta percha, and a portion of it is threaded to receive a metallic nut e, which presses upon an ebonite washer / and clamps the base of an end cap g between it and the bottom edge of the 30 cylinder a. This base cap has a raised circular edge or flange h to embrace the outer edge of the carbon cylinder, and a burring down of the flange fixes it into close holding contact. The stem c extends beyond the nut e, and an extension or lip i of the next adjoining base plate is caused to take over it as shown and be held loosely to it by another nut j, so that the lip is so to speak jointed or hinged 35 to it; the series of base plates to any number for any length of elements or chain being thereby linked to each other. The chamber in each cylinder above the gutta percha wad b receives a kind of cartridge composed of a metallic thimble or inverted cup h, preferably with parallel side walls, and with the inner periphery of a size to exactly fit the head d of the 40 bolt pin, which not only forms the connection of the two metallic bodies, negative and positive, but centralizes the thimble within the carbon cylinder. This thimble & is surrounded by an envelope or casing of parchment paper l, which reaches beyond the closed end of the thimble for containing the salt for exciting purposes, the salt resting upon the thimble in which a small hole has been previously formed for 45 emptying the vessel of liquid, which accumulates within it from the moisture of the salt, the liquid being chlorate of zinc. The top end of the parchment paper is closed in to retain the salt, the paper beino- of such a texture and nature that any moisture supplyed to it finds its way through to damp the salt without permitting the chlorate of zinc or zinc solution 50 to pass through into contact with the carbon cylinder, which would become deteriorated should such happen. In the Drawing I have shown a few of such cylinders as elements of a battery connected at the bases, and with the bodies pushed into and through slits in a strip of fabric or broad tape m (waterproof), the slits being alternately on the same level 55 to obviate tearing it. ... In practice I purpose having these slits formed in the weaving of the fabiic or tape m, they may however be cut, and the cut edges sewn or edged up. Each](https://iiif.wellcomecollection.org/image/b30759249_0003.jp2/full/800%2C/0/default.jpg)
