An early incandescent light bulb with the coils giving electrical contact to the filament inside the glass.
Decades before Thomas Edison filed a patent for his electric lamp, Scotsman James Bowman Lindsay (1799-1862) produced constant electric light in what became a prototype of the modern light bulb.
Building on Humphry Davy's successful yet impractical platinum incandescent light, which he developed in 1802, Lindsay managed to create a more usable form of the light bulb. Having secured a position as a lecturer at the Watt Institution in Dundee, Scotland, in 1829, Lindsay began experimenting with constant electric light. He demonstrated his invention in 1835 at a public meeting in Dundee.
The light from an incandescent bulb is produced from a filament through which an electrical current is passed. Lindsay claimed that, with his light, he could "read a book at a distance of one and a half foot." This was an improvement on Davy's light, which did. Not last as long, was not as bright, and used platinum—an expensive material. The public was impressed by Lindsay's light, which produced no smell or smoke, did not explode, and could be kept on a tabletop.
Lindsay went on to give public lectures about his invention over the following years, but did little with it after that. He neither pursued nor established a patent for his device, and the modern light bulb as we know it would later be developed by others, such as Joseph Swan and Thomas Edison. Even so, Lindsay's invention is considered an important event in the history of lighting, and was one of the first prototypes of today's Incandescent light bulb
