Historical Incandescent Light Bulb Diagram - Early Electrical Lighting Design #2120019 (License: Personal Use)

This black-and-white technical drawing depicts an early incandescent light bulb featuring a dual-loop carbon filament suspended within a pear-shaped glass envelope. The base is a threaded metal socket with the manufacturer’s mark “M S” embossed on its side, likely indicating a specific maker or patent model from the late 1800s. Fine linework highlights shading, glass thickness, and structural details typical of period engineering illustrations.

Used in educational articles, museum exhibits, or historical tech blogs about the evolution of electric lighting; targets users researching Edison-era inventions, patent diagrams, or vintage electrical components.