"It's a simple light bulb I made." Zhuo Ruoning explained to him with a smile.

The second emperor thought it was amazing, and went to the light bulb to check, and found that the flame in the bulb was actually in a straight line, and it was not like the light of an oil lamp or a candle that would shake.

"Why does it automatically catch fire inside?"

Zhuo Ruoning disconnected the interface of the copper wire, the fire was extinguished, and the second emperor saw clearly that there was a thin red-hot iron wire inside.

"Didn't you see anything on fire?"

Zhuo Ruoning laughed: "It is carbonized bamboo silk, which can conduct electricity and glow, but it is not used." ”

"Can this be used as a substitute for candle lighting?" The second emperor asked.

"Yes, but at the moment I can only empty the air in the bottle, carbonized bamboo

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