DescriptionA modern photocopy of a United States Patent Office document, likely related to Edison's electric lamp patent. The document forms part of Edison’s Patent No. 223,898, dated January 27, 1880. The application was filed on November 4, 1879. The patent describes an improvement in electric lamps, specifically focusing on the use of a carbon filament in a vacuum bulb to generate incandescent light. The text outlines the technical details of the light-emitting carbonized filament, the method of vacuum sealing, and the materials used to maintain resistance and efficiency. Edison’s innovation aimed to improve durability and reduce resistance loss, making incandescent lighting more practical.