Image: Dial of Ronalds' electric telegraph
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Original image (1,808 × 1,772 pixels, file size: 1.61 MB, MIME type: image/jpeg)
Description: Revolving alphanumeric dial created by Francis Ronalds as part of his electric telegraph (1816)
Title: Dial of Ronalds' electric telegraph
Credit: Descriptions of an Electrical Telegraph and of some other Electrical Apparatus (1823).
Author: Ronalds F.
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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