白熱電球の発明とその進化
The incandescent light bulb is widely attributed to Thomas Edison, but in reality, British inventor Joseph Swan secured a patent in 1860 for an incandescent lamp using carbonized paper as a filament. However, due to technological limitations, it was challenging to make it practical at that time. Swan continued to improve his design and achieved practical implementation by 1880. Meanwhile, in 1879, Edison developed a bulb using a carbon filament that could glow for about 40 hours. He further extended the bulb's lifespan to approximately 1,200 hours by utilizing bamboo filaments from Japan, significantly contributing to the widespread adoption of electric lighting.
