Emerald Class Cruiser (1920)

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The two light cruisers of the Emerald Class were completed in 1926. A third vessel, Euphrates, was not completed.

Armament

Guns

Seven 6-in guns, 5 on the centre-line and a tandem pair of single mounts forward, had a maximum elevation of 30 degrees.[1][2]

Torpedoes

Fire Control

Range Dials

As of 1920, both ships had a Range Dial Type C with a 10 foot dial.[3]

Rangefinders

Mechanical Aid-to-Spotter

By 1920, both ships were likely equipped with four Mechanical Aid-to-Spotter Mark II*s with Evershed Bearing Transmitters.[4] The installations generally consisted of placing one on each side of the foretop, driven by flexible shafting from a gearbox on the director tower.[5]

Supplies of these devices began in June 1918.[6]

Evershed Bearing Indicators

These ships almost certainly had Evershed gear for gun control from delivery, and would also feature Evershed installations for searchlight control after orders for such installations from February 1917.[7]

Gunnery Control

Control Positions

Control Groups

Directors

All ships were completed with gunnery directors in place.[8]

The director was likely on a pedestal mounting in a tower on the foremast. "X" or 'Y' may have served as a directing gun in addition.[9]

Transmitting Stations

Dreyer Table

In 1930, they are noted as possessing a Dreyer Table Mark III*,[10] presumably installed upon completion.

Fire Control Instruments

Torpedo Control

See Also

Footnotes

  1. ↑ Progress in Naval Gunnery, 1914-1918", p. 10.
  2. ↑ Conways, p. 64.
  3. ↑ Manual of Gunnery of H.M. Fleet, Volume III, 1920, p. 45.
  4. ↑ Manual of Gunnery, Volume III, 1920, p. 35.
  5. ↑ Manual of Gunnery of H.M. Fleet, Volume III, 1920, p. 35, 37.
  6. ↑ The Technical History and Index: Fire Control in HM Ships, 1919, pp. 25-6.
  7. ↑ The Technical History and Index: Fire Control in HM Ships, 1919, p. 29.
  8. ↑ The Technical History and Index: Fire Control in HM Ships, 1919, p. 11.
  9. ↑ Handbook of Captain F.C. Dreyer's Fire Control Tables, 1918., p. 142 and plate opposite.
    I am inferring that the pattern of installation prevalent on the larger light cruisers would be adopted.
  10. ↑ Admiraly. Pamphlet on Mark III* Dreyer Table, 1930, p. 1.

Bibliography

  • Admiralty, Gunnery Branch (1917). The Director Firing Handbook. O.U. 6125 (late C.B. 1259). Copy No. 322 at The National Archives. ADM 186/227.
  • Admiralty, Gunnery Branch (1910). Handbook for Fire Control Instruments, 1909. Copy No. 173 is Ja 345a at Admiralty Library, Portsmouth, United Kingdom.
  • Admiralty, Gunnery Branch (1918). Handbook of Captain F. C. Dreyer's Fire Control Tables, 1918. C.B. 1456. Copy No. 10 at Admiralty Library, Portsmouth, United Kingdom.
  • Admiralty, Technical History Section (1919). The Technical History and Index: Fire Control in H.M. Ships. Vol. 3, Part 23. C.B. 1515 (23) now O.U. 6171/14. At The National Archives. ADM 275/19.
  • Admiralty, Gunnery and Torpedo Division (July, 1919). Progress in Naval Gunnery, 1914-1918. C.B. 902. The National Archives. ADM 186/238.



Emerald Class Light Cruiser
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