Electric lamp. The first electric lamp with a light bulb. It was designed by the American inventor Thomas Alva Edison (1847-1931) in 1879. Edison's design consisted of a carbon filament contained in a vacuum within a sealed glass bulb. By passing an electric current through it, he could heat the filament until it glowed brightly. Edison had invested $50,000 and a year of his time to conduct the 6000 trials whilst researching a practical light bulb.
px | px | dpi | = | cm | x | cm | = | MB |
Details
Creative#:
TOP10242067
Source:
達志影像
Authorization Type:
RM
Release Information:
須由TPG 完整授權
Model Release:
N/A
Property Release:
N/A
Right to Privacy:
No
Same folder images: