site stats
Nikola Tesla in his laboratory, 1896 . He holds a gas-filled, phosphor-coated, wireless light bulb that he developed. The lamp is 250 candlepower, providing the total illumination for a two-second exposure [source: ] [read more: ]
发布时间:
1
数据加载中
Markdown支持
评论加载中...
您可能感兴趣的: 更多