Clear Range Indicator

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Clear Range Indicator Mark III[1]
Clear Range Indicator Mark IV[2]

The Clear Range Indicator was a British torpedo-control instrument developed in a series of Marks.

Two designs, which appear to be those of Marks I and II, were discussed in the Annual Report of the Torpedo School, 1916, having been outlined in .[3]

These were supplied to "all modern ships" by the end of 1917. One was apparently fitted to the holding down ring of the Torpedo Deflection Sight Mark II, and a third type was added to the spindle of the T.D.S. Mark III, an arrangement that was found to be more compact and convenient.[4] Even the Spartan T.D.S. Mark VI had one.

Mark I

This original model was for use in conning towers.[5] It appears that it was separate from the director or sight, and had a graduated disc that could allow the gyro angle to be read off.[6]

Mark II

This model was for use with Torpedo Deflection Sight Mark II.[7]

Mark III

This model was for use with Torpedo Deflection Sight Mark III and could also help determine how much of a course alteration would be required to bring the sights on.[8]

Mark IV

(main article)

This was a new model was for use in conning towers with restricted arcs. It could serve the functions of the previous Marks but also:[9]

  • show "the arcs between which torpedoes can be fired in connection with the restricted arcs of 70 degrees to 110 degrees."
  • the gyro bearings corresponding to those limits

See Also

Footnotes

  1. Annual Report of the Torpedo School, 1918, Plate 108.
  2. Annual Report of the Torpedo School, 1918, Plate 117.
  3. Annual Report of the Torpedo School, 1916, p. 27. (T.O. 39/1916)
  4. Annual Report of the Torpedo School, 1917, p. 195.
  5. Annual Report of the Torpedo School, 1918, p. 165.
  6. Annual Report of the Torpedo School, 1916, p. 27.
  7. Annual Report of the Torpedo School, 1918, p. 165.
  8. Annual Report of the Torpedo School, 1918, p. 165.
  9. Annual Report of the Torpedo School, 1918, p. 165.

Bibliography