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Telephony, Telephone Answering Machines Telegraphone for recording on disc

Telephony, Telephone Answering Machines Telegraphone for recording on disc
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Not available to clients invoiced in the UK
Largest available format 3504 × 2822 px 1 MB
Dimension [pixels] Dimension in 300dpi [mm] File size [MB] Online Purchase
Large 3504 × 2822 px 297 × 239 mm 1.0 MB
Medium 1024 × 825 px 87 × 70 mm 785 KB

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IMAGE number
UIS5083685
Image title
Telephony, Telephone Answering Machines Telegraphone for recording on disc
Auto-translated text View Original Source
Artist
Unknown
Location
Science Museum, London, UK
Medium
object
Image description

Telephony, Telephone Answering Machines Telegraphone for recording on disc. This clock-work-driven disc-type telegraphone was used for magnetic recording and replay of sound, and was a forerunner of the modern dictaphone. The Telegraphone was patented in 1898 by the Danish electrical engineer and inventor Valdemar Poulsen (1869-1942). Poulsen discovered that he could record sound by speaking into a microphone attached to a magnet that was moved slowly across a thin wire. As the wire became magnetised, a trail of sound patterns was recorded. ©SSPL/Science Museum

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SSPL/UIG / Bridgeman Images
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