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Patent Drawing of Light Bulb Filament Design by Lewis H. Latimer (1881)

Drawing
light bulb design, created by Lewis Howard Latimer in 1881. The drawing consists of three labeled figures (Fig. I, Fig. II, and Fig. III) that depict different components of the light bulb, including the filament structure and the internal electrical connections. The document is signed by Latimer himself at the bottom right, confirming his role as the inventor. Latimer’s improvements to incandescent lighting technology, particularly his innovations with carbon filaments, significantly contributed to making electric light bulbs longer-lasting, more efficient, and commercially viable. His work was instrumental in the widespread adoption of electric lighting.
Patent Drawing of Light Bulb Filament Design by Lewis H. Latimer (1881) picture number 1

During the late 19th century, the race to develop practical electric lighting was at its peak, with inventors such as Thomas Edison and Hiram Maxim leading the charge. Latimer, an expert draftsman and engineer, played a crucial role in advancing carbon filament technology, which extended the lifespan of electric bulbs compared to earlier paper-based filaments. Latimer worked closely with Edison at the Edison Electric Light Company, where he patented methods for producing more durable carbon filaments in 1881 and 1882. His contributions paved the way for affordable electric lighting in homes, businesses, and cities around the world. This drawing serves as an original patent sketch that would have been used in formal documentation to secure legal protection for his innovations.

Latimer Family Papers (1870-1996 ) [QPL Full Collection]

Fig. I (Depiction of filament design) Fig. II (Diagram of light bulb structure with filament inside) Fig. III (Base of the bulb, illustrating electrical connection points) Witnesses. (Text at bottom left, partially faded) Inventor L. H. Latimer (Signature, bottom right) 1881 (Year written near the signature)