File:EB1922 Telegraph - Diagram of Polar Relay for Cable Telegraph System.jpg
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Summary
| Description |
English: Diagram of Polar Relay for Cable Telegraph System. |
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| Date | published 1922 | |||
| Source | “Telegraph,” Encyclopædia Britannica (12th ed.), v. 32, 1922, p. 704, fig. 10. | |||
| Author | William Noble | |||
| Permission (Reusing this file) |
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 22:35, 31 October 2019 | | 892 × 1,032 (112 KB) | Bob Burkhardt | {{Information |description ={{en|1=Diagram of Polar Relay for Cable Telegraph System.}} |date =published 1911 |source =“Telegraph,” ''Encyclopædia Britannica'' (12th ed.), v. 32, 1922, p. 704, fig. 10. |author =William Noble |permission ={{PD-Britannica}} }} Category:Telegraph instruments |
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