Colossus Class Battleship (1910)

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Radio

According to the ambitions of 1909, these ships had Service Gear Mark II wireless upon completion.[1]

Armament

Main Battery

This section is sourced in The Sight Manual, 1916 except where otherwise noted.[2]

The ten 12-in guns were Mark XI mounted in B XII turrets. The mountings could elevate 15 degrees and depress 5 degrees.

The gun sights were cam-worked and limited to 15 degrees elevation though the dials were only scaled to 14 degrees. 6 degree super-elevation prisms would have been provided by 1916. They were the first FTP turret sights in Royal Navy use, but otherwise much like the sights in Neptune.

The deflection gearing constant was 70.8, with 1 knot equalling 2.30 arc minutes, calculated as 2850 fps at 5000 yards. Range drums were provided for full charge at 2850 fps, reduced charge at 2300 fps, as well as 6-pdr sub-calibre gun and .303-in aiming rifles.

Muzzle velocity was corrected by adjustable scale plate between +/- 75 fps. The adjustable temperature scale plate could vary between 60 to 100 degrees Fahrenheit,[Fact Check] and a "C" corrector could alter the ballistic coefficient by at least +/- 15% and possibly 20% as in other sights.[Fact Check]

Drift was corrected by inclining the sight bracket by 3 degrees and having 1.3 knots permanent right deflection.

The side position sighting lines were 37.83 inches above and 39.5 inches abreast the bore, and the central scopes were 49.25 inches above and 42 inches abreast.

The hydraulic controls in training reflected the final advance for the Royal Navy, to a seven-cylinder swash-plate engine from Elswick; operated by a single hand wheel, responsive training would permit continual aim in all but the heavy seas. Elevation may have been a little less refined, requiring three turns of a handwheel to reach the maximum 3 degrees per second elevation rate.[3]

Secondary Battery

This section is sourced in The Sight Manual, 1916.[4]

Sixteen 4-in BL Mark VII guns on P IV* mountings were arranged for broadside fire. They were similar to the equipment fitted in Lion, Orion, Gloucester.

The mounting could elevate 15 degrees and depress 10 degrees, but though its sight could match the 15 degree elevation, the range dial was only graduated to 11.5 degrees (10,000 yards).

These cam-worked sights had range dials for 2750 fps, and 1-in and .303-in aiming rifles. MV could be corrected by adjustable pointer through +/- 150 fps.

Unlike later P IV* sights such as in Bellona, these sights were not FTP sights.

The deflection gearing constant was 64.277 with 1 knot equal to 2.41 arc minutes, corresponding to 2800 fps at 2000 yards. Drift was corrected by inclining the sight 2 degrees.

The layer's sight line was 13.73 inches above the bore, and 15.85 inches left. The trainer's sight line was 15.08 inches above and 14.9 inches right.

The sight had a temperature correcting scale plate and a "C" corrector.

The layer had an open sight. The trainer's sight could be used as a free sight with a counterweight.

Torpedoes

These were the first British battleships to feature 21-in torpedoes.[5]

Three 21-in submerged tubes:[6]

  • two broadside tubes forward 12 feet, 7.4375 inches below load waterline, depressed 2 degrees with axis of tube 1 foot 7.5625 inches above the deck.
  • one stern tube 8.5 feet below load WL, depressed 1 degree with axis of tube 1 foot 8.625 inches above the deck.

The torpedoes for the stern tubes were probably removed sometime during or after 1916 to increase numbers available for broadside use in the fleet.[7] The stern tubes themselves were removed in 1917-18.[8]

Fire Control

Rangefinders

The ships had six rangefinders: one in each turret, one in the forward spotting top and one in the aft superstructure.[9]

Sometime during or after 1917, an 9-foot rangefinder on an open mounting was to be added specifically to augment torpedo control. It seems likely that Hercules received hers before Colossus.[10][11]

In 1918, a high angle rangefinder, likely a 2m F.T. 29, was installed over the fore top; the top mast was retained.[12]

Evershed Bearing Indicators

The two units were fitted with this equipment before late 1914, albeit in a slightly different manner.[13]

Colossus's transmitting positions were

  • Conning Tower
  • Fore control platform (transmitters to port and starboard with C.O.S. to select one in use)
  • "A" turret
  • "X" turret

Hercules's transmitting positions were

  • Conning Tower
  • Fore bridge (transmitters to port and starboard with C.O.S. to select one in use)
  • "A" turret
  • "X" turret

The protocols for handling wooding of the turrets is outlined in the Handbook for Fire Control Instruments, 1914.[14]

Mechanical Aid-to-Spotter

At some point, both ships were equipped with two Mechanical Aid-to-Spotter Mark Is, one on each side of the foretop, keyed off the Evershed rack on the director. As the need for such gear was apparently first identified in early 1916, it seems likely that these installations were effected well after Jutland.[15]

Gunnery Control

The control arrangements were as follows.[16]

In 1910, it was decided that the telaupad control of the secondary battery in Neptune, Indefatigable, Hercules and Colossus should be replaced with Rudolph voicepipes. Other ships in the Home Fleet had also been experimentally fitted, but a report on a final decision was still pending.[17]

Control Positions

  • Fore top
  • Gunnery control tower
  • "A" turret
  • "X" turret

Some ships had C.O.S.s within the control positions so they could be connected to either TS.[18]

Control Groups

The five 12-in turrets were each a separate group with a local C.O.S.[Inference] so that it could be connected to

  • Forward TS
  • After TS
  • Local control from officer's position within turret

Directors

Main Battery

The ships were fitted with a cam-type tripod-type director in a light aloft tower on the foremast along with a directing gun (in "Y" turret?).[19] The battery was not divisible into groups for split director firing.[20]

Secondary Battery

The 4-in guns never had directors installed.[21]

Torpedo Control

By mid 1917 and likely a considerable time before,[Inference] all ships in the class were provided a Torpedo Control Plotting Instrument Mark I in the TCT.[22]

Transmitting Stations

Like nearly all large British ships of the era prior to King George V and Queen Mary,[23] these ships likely had 2 TSes.

Dreyer Table

Hercules was equipped with the Original Dreyer Table for some period from 1911 through at least April 1914,[24] brought along with Captain Dreyer when he left Prince of Wales.[25]

The ships eventually each received a Dreyer Table Mark I,[26] but were never given Dreyer Turret Control Tables.[27]

Fire Control Instruments

Breaking a pattern of acquisition dating back to the Bellerophon class, this class used Vickers F.T.P. Mark III range and deflection instruments (with cross-connected Mark III* range transmitters[28]) when sending data to gun sights, retaining Barr and Stroud (probably Mark II*[Inference]) instruments for other destinations.[29]

The ships also had Target Visible and Gun Ready signals to indicate which turrets could see the target and which guns were ready mounted in the TSes and control positions.[30]

See Also

Footnotes

  1. ARTS 1908 Wireless Appendix, p. 13.
  2. The Sight Manual, 1916, pp. 33-34, 106, 108-109, Plate 10.
  3. Brooks. Dreadnought Gunnery and the Battle of Jutland, pp. 45-46.
  4. The Sight Manual, 1916, pp. 86, 108, Plate 39.
  5. Burt. British Battleships of World War I, p. 121.
  6. Addenda (1911) to Torpedo Manual, Vol. III., 1909, p. 155.
  7. Annual Report of the Torpedo School, 1916, p. 36. (T.O. 168/1916)
  8. Burt. British Battleships, p. 128.
  9. Burt. British Battleships, p. 121.
  10. Annual Report of the Torpedo School, 1917, p. 198. (C.I.O. 481/17) mentions Hercules
  11. Annual Report of the Torpedo School, 1918, p. 176. mentions Colossus
  12. Burt. British Battleships, p. 128.
  13. Handbook for Fire Control Instruments, 1914, p. 36.
  14. Handbook for Fire Control Instruments, 1914, p. 36.
  15. The Technical History and Index: Fire Control in HM Ships, 1919, pp. 25-6.
  16. Handbook for Fire Control Instruments, 1914, p. 7.
  17. Annual Report of the Torpedo School, 1910, p. 149. (A.L.G. 12731/10/18960 of 16 Aug 1910)
  18. Handbook for Fire Control Instruments, 1914, p. 7.
  19. The Director Firing Handbook, 1917. pp. 88, 142.
  20. The Director Firing Handbook, 1917. p. 88.
  21. absent from list in The Director Firing Handbook, 1917. pp. 143.
  22. Handbook of Torpedo Control, 1916, p. 38. Inference based on Mark II gear being in place in other ships in 1915.
  23. Handbook for Fire Control Instruments, 1914, pp. 6-7.
  24. Admiralty Weekly Orders (ADM 182/5), p. 4.
  25. Pollen Aim Corrector System, Part I. Technical History and Technical Comparison with Commander F. C. Dreyer's Fire Control System, p. 12.
  26. Handbook of Capt. F.C. Dreyer's Fire Control Tables, p. 3.
  27. absent from list in Handbook of Capt. F.C. Dreyer's Fire Control Tables, p. 3.
  28. Annual Report of the Torpedo School, 1910, p. 148.
  29. Handbook for Fire Control Instruments, 1914, pp. 72.
  30. Handbook for Fire Control Instruments, 1914, p. 11.

Bibliography

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