Pattern 16XX Loud Speaking Telephones
From The Dreadnought Project
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.
- Torpedo Drill Book, 1905. pp. 234-6.
- H.M.S.O., London Torpedo Drill Book, 1905 (Corrected to December, 1904). Copy in Tony Lovell's library.