File:EB1911 Telegraph - Modern “Sounder”.jpg
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EB1911_Telegraph_-_Modern_“Sounder”.jpg (633 × 446 pixels, file size: 102 KB, MIME type: image/jpeg)
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| Description |
English: The modern pattern of “sounder” as used by the British Post Office for reception of telegraphy. Dots and dashes are distinguished by the interval between the sounds of the instrument. It consists only of an electromagnet, with its armature lever arranged to stop against an anvil or screw in such a way as to give a distinct and somewhat loud sound. The magnet is wound to a resistance of 40 ohms (or 900 ohms when worked from accumulators), and the instrument is worked with a current of 400 milliamperes (25 milliamperes with accumulators). |
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| Date | published 1911 | |||
| Source | Encyclopædia Britannica (11th ed.), v. 26, 1911, “Telegraph,” p. 516, Fig. 15. | |||
| Author | Harry Robert Kempe (section author) | |||
| Permission (Reusing this file) |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 19:38, 18 February 2016 | | 633 × 446 (102 KB) | Library Guy | {{Information |Description ={{en|1=The modern pattern of “sounder” as used by the British Post Office for reception of telegraphy. Dots and dashes are distinguished by the interval between the sounds of the instrument. It consists only of an el... |
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