File:EB1922 Telephone - signalling of the digit 7.jpg
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Summary
| Description |
English: Machines are operated by impulses originating in a subscriber's telephone. The standard impulse is a disconnexion of the subscriber's loop (the loop having been closed in the first instance by the lifting of the subscriber's receiver). The train of impulses corresponds to the digit signalled. For instance, the signalling of the digit 7 would constitute a series of seven disconnexions of the subscriber's telephone loop as indicated in the diagram. |
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| Date | published 1911 | |||
| Source | “Telephone,” Encyclopædia Britannica (12th ed.), v. 32, 1922, p. 707, fig. 1. | |||
| Author | Unknown author | |||
| Permission (Reusing this file) |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 22:41, 20 November 2019 | | 818 × 80 (9 KB) | Bob Burkhardt | {{Information |description ={{en|1=Machines are operated by impulses originating in a subscriber's telephone. The standard impulse is a disconnexion of the subscriber's loop (the loop having been closed in the first instance by the lifting of the subscriber's receiver). The train of impulses corresponds to the digit signalled. For instance, the signalling of the digit 7 would constitute a series of seven disconnexions of the subscriber's telephone loop as indicated in the diagram.}} |date... |
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