Poulsen’s steel disc telegraphone

From Object Wiki

Poulsen’s steel disc telegraphone
Manufacturer	Poulsen
Production years	1903
Production location	(unknown)

Danish Engineer Valdemar Poulsen experimented with magnetic recording from the late 1890s. This machine was designed to make records that could be sent through the post as a medium of correspondence. The record was made on a thin steel disc clamped on a clockwork-driven turntable. The recording head was a finely pointed needle around which was wound a coil of many turns of thin wire. The needle rested on the steel surface and traversed across it as it rotated. The recorded speech was heard through two telephone earpieces. Recordings were erased using the spade-ended bar magnet.

[edit] How it works

[edit] Memories

Do you remember this object? Add your memories.

[edit] In the Science Museum's Records

Inv. No: 1955-13 Source: T G Hellyer