Patent of photographic lamp

Edison didn't invent the earliest electric light. Edison only improved the filament material of incandescent lamp to make the whole incandescent lamp have a longer service life. Joseph swan was the first inventor of the incandescent lamp. He invented the earliest incandescent lamp in 1860, and applied for the patent of incandescent lamp in 1878. He was also the first person in the world to illuminate his residence with incandescent lamps.

Joseph swan was not engaged in scientific inventions at first, but came from chemistry. Later, he was invited by a photography manufacturing company to be a technical consultant, and when he was a technical consultant, he invented a new type of photographic film, which simplified the film processing technology at that time and avoided many disadvantages of the original film. However, although Swan is a chemist, his favorite research field is how to make dots produce light.

The earliest scientists used heating platinum wire to generate light energy, but platinum wire is expensive and has a short service life, so it cannot be used as a long-term light supply device. Swan replaced platinum wire with carbon wire on their basis, but carbon wire burns very fast in the air. The clever swan thought of putting carbon wire in a vacuum glass cover, so he invented a semi-vacuum carbon wire electric lamp, but due to the backward technology at that time, this product still failed to achieve the expected effect.

Later, Swan improved his invention and applied for the patent of incandescent lamp in 1878 (one year earlier than Edison). Later, the great inventor Edison further studied the incandescent lamp of swan to improve its life. Edison failed thousands of times. After trying thousands of materials, he found the most practical one at that time? Carbonized bamboo filament lamp? The incandescent lamp made of this material can be continuously lit for more than 1000 hours, which greatly prolongs the service life of the incandescent lamp.