Pattern 16XX Loud Speaking Telephones
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The Royal Navy's Pattern 1639 (for upper deck use) and Pattern 1643 (for engine room use) Graham Telephones were created some time before 1905 for shipboard communication.[1]
Form Factor
Service Life
See Also
Footnotes
- ↑ Torpedo Drill Book, 1905. pp. 234-6.
Bibliography
- H.M.S.O., London Torpedo Drill Book, 1905 (Corrected to December, 1904). Copy in Tony Lovell's library.
