King Edward VII Class Battleship (1903)

Overview of 8 vessels
Citations for this data available on individual ship pages
Name	Builder	Laid Down	Launched	Completed	Fate
Africa	Chatham Royal Dockyard	27 Jan, 1904	20 May, 1905	Nov, 1906	Sold 30 Jun, 1920
Britannia	Portsmouth Royal Dockyard	4 Feb, 1904	10 Dec, 1904	Sep, 1906	Torpedoed 9 Nov, 1918
Commonwealth	Fairfield	17 Jun, 1902	13 May, 1903	Mar, 1905	Sold 18 Nov, 1921
Dominion	Vickers	23 May, 1902	25 Aug, 1903	Jul, 1905	Sold 9 May, 1921
Hibernia	Devonport Royal Dockyard	6 Jan, 1904	17 Jun, 1905	2 Jan, 1907	Sold 8 Nov, 1921
Hindustan	John Brown	25 Oct, 1902	19 Dec, 1903	22 Aug, 1905	Sold 9 May, 1921
King Edward VII	Devonport Royal Dockyard	8 Mar, 1902	23 Jul, 1903	7 Feb, 1905	Mined 6 Jan, 1916
Zealandia	Portsmouth Royal Dockyard	9 Feb, 1903	4 Feb, 1904	11 Jul, 1905	Sold 8 Nov, 1921

Radio

The class was the first to generally be fitted with Service Gear Mark II, but in 1908, King Edward VII and Hindustan were two of just nine equipped with the "C" Tune Gear, capable of transmitting on "S", "U" and "W" tunes. Those two were slated to receive a Service Mark II set in 1909.

Armament

During the war, along with those of other older ships, the ten 6-inch guns casemated on the first deck proved of little use in practical sea states. It was first proposed to remove all of them, but this would have left the ships too weak against torpedo craft or in low visibility. Eventually, it was decided to remove the ten casemate guns, plate their ports over with 2 inch armour and move 4 of them to the upper deck (where two were already located).

12-in Guns

This section is sourced in The Sight Manual, 1916.

The four 12-in guns were Mark IX mounted in B VII S turrets. The mountings could be elevated 13.5 degrees and depressed 5 degrees.

These turrets were the first to have a central sighting position with sights for both guns within. This pattern was to persist in later capital ships, giving each twin turret a total of 4 sights, with the training of the mount generally being done from the central position.

The gun sights were gear-worked sights with telescopes (periscopes would not debut until the St. Vincent class) and limited to 13.5 degrees elevation, which was 15,000 yards for full charge.

Somewhat unusually, the side and centre position sights differed in many particulars. Additionally, Africa, Britannia and Hibernia had sights, often called the "Africa sight" that differed in some details, which are noted parenthetically below. In 1906, ships with older 12-in mountings B V, VI and VII were retrofitted with "Africa sights".

The side sights had a range gearing constant of 22.5 (40) and range drums provided for full charge at 2525 fps, reduced charge at 2100 fps, as well as for 6-pdr sub-calibre guns and .303-in aiming rifles. Muzzle velocity was corrected by adjustable pointer between +/- 100 fps.

The deflection gearing constant for the side sights was 80 (72.3), with 1 knot equalling 2.64 arc minutes, calculated as 2600 fps (2525) at 5000 yards.

Drift was corrected in the side sights by inclining the pivot 1 degree. The side position sighting lines were 40.3 inches above and 41.35 inches abreast the bore.

The centre position sights had a range gearing constant of 22.5 (43.3). The centre sights lacked MV correction devices and instead had more range drums provided: five drums proceeded from 2475 to 2575 fps by 25 fps, and another five drums range from 2050 to 2150 fps. 6-pdr sub-calibre and .030-in aiming rifle drums were also provided.

The centre sight's deflection gearing constant was 80 (72.6 in ABH) with 1 knot equalling 2.64 (2.63) arc minutes, calculated as 2600 fps at 5000 yards.

Drift was corrected in the centre sights by inclining the pivot 1.833 degrees. The centre position sighting lines were 44.9 (42.3) inches above and 43 (20.7) abreast in the centre position.

No explicit mention is made of a temperature corrector, but there was a "C" corrector able to at least modify the ballistic coefficient by +/- 10%.

9.2-in Guns

This section is sourced in The Sight Manual, 1916.

The 9.2-in guns were B.L. Mark X on Mark V S mountings, as also used in the Warrior class cruisers, able to elevate 15 degrees and depress 5 degrees.

The sights were gear-worked with a range gearing constant of 37.04, graduated to 15 degrees (or 15,400 yards, full charge). Range dials were provided for full charge at 2850 fps, a second for 2750 fps, reduced charge at 2225 fps and 3-pdr sub-calibre and .303-in aiming rifle. The 2850 fps dial was noted as having range errors exceeding 25 yards, as it employed the same cam cut for the 2750 fps dial. The 2750 fps dial would be used for calibrating the sight. MV was corrected by adjustable pointer allowing a 100 fps decrease (only).

The deflection was on a gearing constant of 77.98, 1 knot being 2.61 arc minutes, calibrated for 2750 fps at 5000 yards.

Drift was corrected by inclining the sight bracket 1.5 degrees. The sighting lines were 14.5 inches above the bore and 45 inches abreast the bore.

A "C" corrector was fitted, presumably also a temperature corrector.

6-in Guns

6-in Fire Control Circuits

The twelve 6-in guns (on Dominion, Commonwealth, Hindustan and Zealandia, at least) were Mark VII, on P. III, P. III*, P. III S and/or P. IV mountings. Ten were casemate guns on the main deck, and two were on the upper deck between the 9.2-in gun turrets.

The gear-worked sights were similar to those in Albemarle and Cornwall, but sturdier, with a range gearing constant of 51.41 and range dials for 2730 fps, 1970 fps, 3-pdr sub-caliber, 1-in aiming rifle and .303-in aiming rifle. M.V. correction was by adjustable pointer for +/- 50 fps.

The deflection gearing constant was 82.62, with one knot of deflection being 2.77 arc minutes, calibrated as 2730 fps at 3000 yards.

Drift correction was achieved by inclining the sight 1.5 degrees.

The sighting lines were 14.45 inches above the bore and 13.1 inches to the side for both sighting positions.

12-pdr Guns

High velocity 12-pdr 18 cwt guns were mounted on P IV* mountings, similar to those in the Lord Nelson, Minotaur and Dreadnought classes.

The mounting could elevate to 20 degrees and depress to 10 degrees, but though its sight could match the 20 degree elevation, the range dial was only graduated to 14.5 degrees (7,900 yards). This was fine, as there was limited fire control support provided for them and the weapons proved to have little effectiveness at the ranges where torpedo attack became deeply worrying.

The gear-worked sights were similar to the P IV type, but added a cross-connected trainer's sight. They had a range gearing contant of 54 and range dials for 2550 fps, 1962 fps, and 1-in and .303-in aiming rifles. The first series produced corrected for MV with detachable cams for 2600, 2575, 2550, 2525 and 2500 fps. The second series replaced these with an adjustable pointer for +/- 50 fps.

The deflection gearing constant was 63.38 with 1 knot equal to 2.96 arc minutes, corresponding to 2600 fps at 2000 yards. Drift was corrected by inclining the sight carrier arm 2 degrees.

The layer's and trainer's sight lines were 10 inches above the bore, and 10.25 inches abreast.

The sight lacked a "C" corrector. There do not seem to be temperature correctors or open sights.

Torpedoes

In 1913, it was approved, as part of a general reallocation of 18-in torpedoes, to replace the torpedoes on these ships with Mark VI* H. and Mark VI** H. Mark VI*** H. torpedoes.

Fire Control

Fire Control Circuits

The general system of wiring between the TSs in ships prior to Lord Nelson class is illustrated in Handbook for Fire Control Instruments, 1914.

Evershed Bearing Indicators

Evershed Installation
Showing 'X' as a transmitting position.

Installed by late 1914, these ships had transmitting positions in the fore control top and in the forward 12-in turret. The control top had transmitting telescopes to port and starboard with a COS to select the one to use. Both 12-in and all 4 9.2-in turrets were receiving positions, each with an open-face indicator and a turret trainer's indicator.

Gunnery Control

The ships' guns were organized in 5 groups:

1. Two 12-in turrets
2. Two Starboard 9.2-in turrets
3. Two Port 9.2-in turrets
4. Starboard 6-in guns
5. Port 6-in guns

Local Control in Turrets

There was no provision in these ships for local turret control wherein the receivers in the turret could be driven by transmitters in the officer's position at the back of the turret.

Directors

Directors were ordered only for Commonwealth and Zealandia on 23 July, 1917 for use in bombardment. Commonwealth was fitted with her director in May 1918, but Zealandia's installation was suspended by the cessation of work on ships at war's end.

These ships never received directors for their secondary batteries.

Transmitting Stations

These ships had fore and aft TSes.

A C.O.S. allowed control options of

1. Fore
2. After
3. Separate

Each group had transmitters (of various kind, see below) with a pair of receivers, one wired directly to the transmitter as a tell-tale, and the other fed off the wires going to the distant guns (i.e., the aft guns for the fore TS and vice-versa) as a repeat. "These repeat receivers are necessary to keep the idle transmitters in step; when changing back from separate control they are required to enable both halves of the group to be set alike before being paralleled on to one transmitter."

Dreyer Table

These ships never received Dreyer tables.

Fire Control Instruments

The ships in this class varied in their instruments.

In 1905, Commonwealth, Hindustan, King Edward VII and Zealandia were slated to be equipped with Barr and Stroud Mark I range and order instruments (the range instruments probably changed to Mark II before installation), and Vickers deflection instruments. However, by 1909, these 4 were apparently equipped entirely with Barr and Stroud Mark II equipment. I think it most likely that plans had changed before the ships received the earlier assortment of instruments.

The Handbook for Fire Control Instruments, 1909 lists the Barr and Stroud Mark II equipment on this class (presumably, only Commonwealth, Hindustan, King Edward VII and Zealandia) as:

• Combined Range, Order, Deflection: 10 transmitters, 46 receivers
• Group Switches: 5
• Rate: 4 transmitters, 12 receivers
• Bearing: 2 transmitters, 2 receivers (King Edward VII only)

Additionally, this class had the following Graham fire control equipment:

• Turret fire gongs: 14 with 6 keys
• Fire Gongs: 10 with 4 keys
• Captain's Cease Fire Bells: 20 with 1 key

By 1909, Africa, Britannia, Dominion and Hibernia were equipped with instruments from Vickers paired with Barr and Stroud rate instruments. The Handbook for Fire Control Instruments, 1909 lists their equipment as:

• Vickers range transmitters: 10
• Vickers deflection transmitters: 10
• Vickers combined range and deflection receivers: 36 (28 in Dominion)
• C.O.S.: 5
• Check fire switches: 10 (6 in Dominion)
• Barr and Stroud rate transmitters: 4 transmitters
• Barr and Stroud rate receivers: 12 receivers
• Siemens turret fire gongs: 14 with 6 keys
• Vickers fire gongs: 10 with 4 keys (12 and 4 and Siemens in Dominion)
• Captain's Cease Fire Bells: 20 with 1 key (supplier not stated)

None of the ships had Target Visible or Gun Ready signals.

In 1911, it was decided that Africa, Dominion, Hibernia and Britannia should have Siemens Pattern 120 turret fire gongs adapted so they could be rung mechanically.

See Also

• Wikipedia

Bibliography

• Admiralty, Technical History Section (1920). The Technical History and Index: Alteration in Armaments of H.M. Ships during the War. Vol. 4, Part 34. C.B. 1515 (34) now O.U. 6171/20. At The National Archives, Kew, United Kingdom.
• H.M.S. Vernon. Annual Report of the Torpedo School, 1911, with Appendix (Wireless Telegraphy). Copy 15 at The National Archives. ADM 189/31.
• 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 (1914). Handbook for Fire Control Instruments, 1914. G. 01627/14. C.B. 1030. Copy 1235 at The National Archives. ADM 186/191.
• 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 (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.
• McBride, Keith. "The Wobbly Eight": King Edward VIII Class Battleships, 1897-1922, Warship 2001-2002