Historical Incandescent Light Bulb Diagram - Early Electrical Lighting Design #2140642 (License: Personal Use)

This black-and-white technical illustration depicts an early Edison-style incandescent lamp, featuring a pear-shaped glass envelope, dual coiled filaments suspended by support wires, and a robust threaded metal base marked “M S”. The shading and linework suggest a late 1800s patent or engineering manual origin, emphasizing structural clarity over realism. Fine stippling indicates glass transparency and metallic texture, typical of period scientific engravings.

Used in educational articles, museum exhibits, or historical tech blogs discussing the evolution of electric lighting; serves users researching early electrical engineering, patent history, or vintage illumination design.