Vickers Range Clock

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A Vickers Range Clock's mechanism revealed.[1]

The Vickers Range Clock was a simple clockwork range clock, Admiralty Pattern Number 3778[1] built by Vickers to a conceptual design suggested by Percy Scott. It was built in large numbers starting in 1906.[2]

By 1920, there were several models:[3]

  • 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

See Also


  1. 1.0 1.1 Admiralty. Pamphlet on Minor Fire Control Instruments, 1946, Plate 4.
  2. Brooks, John. Dreadnought Gunnery and The Battle of Jutland: The Question of Fire Control p. 25.
  3. 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 and