๐”– Bobbio Scriptorium
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A Thermal Telephone Transmitter

โœ Scribed by Forbes, G.

Book ID
120125753
Publisher
The Royal Society
Year
1887
Weight
137 KB
Volume
42
Category
Article
ISSN
0365-0855

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Trouvg has invented a cylindrical microphone, which resembles a small dark-lantern, with a carbon crayon substituted for the candle. When placed in the middle of a room, it reveals all secrets. It transmits the voice admirably to a receiving telephone, even when the speaker stands 25 metres (82 ft.)