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Updated: May 11, 2025
Edison had previously made a vast number of experiments with carbonized paper for various electrical purposes, with such good results that he once more turned to it and now made fine filament-like loops of this material which were put into other lamps.
A curious mechanism lay revealed. There was a powerful spring, which could be wound up with a key, and a drum wound with filament-like wire and connected with a simple clock-work to revolve it. Two small dry-batteries were secured to one side of the box, their wires running to the drum. "Why, it's nothing but a toy catapult!" I said. "That's all," and Godfrey nodded.
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