Vickers Range Clock
The Vickers Range Clock was a simple clockwork range clock, Admiralty Pattern Number 3778 built by Vickers to a conceptual design suggested by Percy Scott. It was built in large numbers starting in 1906.
By 1920, there were several models:
- Pattern 105 with a single-friction disc and rate drum with spiral scale
- Pattern 710 similar, with a double-friction disc and rate drum
- Pattern 816 with double-friction works and cyclometer range counter
- Pattern 3778 with double friction works and rate dial
- Vickers' Transmitting Clock
- Vickers' Transmitting Clock Mark F
- Elliott's Range Keeping Instruments Marks I and II (obsolescent in 1920)
- Elliott's Range Keeping Instruments Marks III and IV
- Admiralty. Pamphlet on Minor Fire Control Instruments, 1946, Plate 4.
- Brooks, John. Dreadnought Gunnery and The Battle of Jutland: The Question of Fire Control p. 25.
- Manual of Gunnery for HM Fleet, Volume III, 1920, pp. 19-20
- Admiralty, Gunnery Branch (1946). Handbook On Minor Fire Control Instruments 1946. B.R. 1534. Copy at Admiralty Library, Portsmouth, United Kingdom. A partial web equivalent is available at H.N.S.A..
- Brooks, John (2005). Dreadnought Gunnery and the Battle of Jutland: The Question of Fire Control. Oxon: Routledge. ISBN 0714657026. (on Amazon.com and Amazon.co.uk).