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Tarns lighted a benzolene hand-lamp at the gas, and silently left the bedroom. She still somewhat feared an unlawful invader, but the arrival of Rachel had reassured her. Preceded by the waving little flame, she passed Rachel's door, which was closed, and went downstairs. Every mysterious room on the ground floor was in order and empty. No sign of an invasion.
At last he filled his mouth with benzolene, saying that he would burn it as he allowed it to escape.
Edison found that the same property might be applied to regulate the strength of a current in conformity with the vibrations of the voice, and after a great number of experiments produced his 'carbon transmitter. Plumbago in powder, in sticks, or rubbed on fibres and sheets of silk, were tried as the sensitive material, but finally abandoned in favour of a small cake or wafer of compressed lamp-black, obtained from the smoke of burning oil, such as benzolene or rigolene.
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