Historical U-Shaped Arc Lamp Diagram - Early Electric Lighting Technology #1237150 (License: Personal Use)

This black-and-white line drawing depicts a U-shaped electric arc lamp, a precursor to modern lighting systems, featuring two vertically aligned carbon electrodes housed within an arched glass enclosure. The electrodes are secured by insulated clamps mounted on a stepped ceramic or ebonite base to prevent short-circuiting and manage heat dissipation. Such lamps were commonly deployed in streetlights and lighthouses before incandescent bulbs became widespread.

Used in educational, historical, or museum web pages about the evolution of electric lighting; targets users researching early electrical engineering, antique lighting devices, or STEM history content.