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

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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$5 10 15 20 25 VAAAAAAA/ A.D. 1876, 28th September. N° 3782. KAA/WW^ \AAAAAA/V> /\AA Appliances for Generating and Applying Electricity. LETTERS PATENT to Isac Louis Pulvermacher, of 104, Regent Street, in the County of Middlesex, Electrical Engineer, for the Invention of “ Improve¬ ments in Apparatus or Appliances connected with Generating, Con¬ ducting, Measuring, or Testing and Applying Electricity.” Sealed the 23rd March 1877, and dated the 28th September 1870. PROVISIONAL SPECIFICATION left by the said Isac Louis Pulvermacher at the Office of the Commissioners of Patents on the 28th September 1876. Isac Louis Pulvermacher, of 194, Regent Street, in the County of Middlesex, Electrical Engineer. “ Improvements in Apparatus or Appliances connected with Generating, Conducting, Measuring, or Testing 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 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 salt of ammonia 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 of a constant action is produced by the atmospheric oxygen absorbed by the porous carbon vessel. The oxygen in presence of the salt of ammonia 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. According to my second improvement I form hollow vessels composed in part of zinc and part of carbon, united and fixed together so as not to come in direct con- ductible contact, and to furnish the hollow space for the reception of the salts, serving to excite and maintain an electric current with constancy. According to the third improvement I substitute platinized silver coated with platinum black for the carbon parts referred to in the second portion of the fore- going. My fourth improvement consists in making a resistance coil for measuring and testing the strength of an electric current from bands made of thin German silver [Price 8c?.]$

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