爱迪生的实验室测试了取材于不同植物的碳化灯丝，有月桂，黄杨木，胡桃木，雪松，亚麻和竹子。

Edison's lab tested carbonized filaments made from plants as diverse as baywood, boxwood, hickory, cedar, flax and bamboo.

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这回他不用烧焦的纸，而代之以几股棉线。他把几股棉线搓在一起，呈发夹状，然后把已搓成的灯丝放在炉内烧焦，也就是使之碳化。

This time, instead of using charred paper, he took several strands of cotton, twisted these together into the shape of hairpin, and charred, or carbonized, this filament in an oven.

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