Britain
4.7"/40 (12 cm) Elswick
4.7"/40 (12 cm) QF Marks I, II, III, IV and VI
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Italy
120 mm/40 (4.7") Models 1889, 1891 and 1893
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Japan
4.7"/40 (12 cm) Elswick
4.7"/40 (12 cm) 41st Year Type
12 cm/40 (4.7") 41st Year Type
Updated 14 July 2014

The British firm of Elswick built numerous 4.7"/40 (12 cm) guns for export during the late 1800s and they armed the ships of many nations.  The long history of the 4.7" (12 cm) gun in British service started with with the acquisition of an Elswick Pattern "M" in 1886.  Although this particular weapon was not adopted for service use by Britain, its caliber was selected for secondary guns on many ships built in the late 1800s.  Pattern "M" was used in limited numbers on Italian ships.

Guns of this caliber were manufactured for both the Navy and the Army, with many transfers taking place between the services.  The Army used them for coastal defense batteries and as field armament, with special gun carriages being built to handle the trunnions.

All of these guns were of built up construction and generally similar.  Of the Elswick guns in British service, the Mark I was an Elswick Pattern "P", Mark II was Pattern "Q" and Mark III was Pattern "T".  Mark I was constructed of A tube, jacket, five B hoops to the muzzle, screwed securing ring and breech ring.  The interrupted screw breech block with conical fore part was taken by the jacket.  Mark II differed principally in having three B hoops and a short C hoop screwed to the jacket.  Mark III differed by having a B hoop, two B tubes and a shorter C hoop.  Mark IV was partially wire wound with B tube, jacket, very short C hoop and breech ring.  The breech block was taken by a breech bush screwed into the A tube.  All Marks originally used a three-motion screw breech.

Weapons designated with the letter "A" indicated a modification to the three-motion breech mechanism while the letter "B" indicated a conversion to a single motion breech mechanism.  British naval guns that had the breech ring altered to suit Army field mountings were given a single star in the designation.  Guns with two stars are believed to have been further altered to add a cartridge retaining catch in order to allow HA fire.  In the early part of World War I, ten guns were removed from the Latona class minelayers, adapted for AA fire and then assigned to the London defenses.  These appear to have been ineffective in that role.

154 Mark I, 91 Mark II, 338 Mark III and 584 Mark IV were manufactured.  776 of these guns were built specifically for the Navy and an additional 110 were transferred to the Navy from the Army.  During World War I Japan transferred to Britain 13 Mark IVJ guns (the J presumably being for "Japan") and 24 stock (Elswick) guns.  Australia manufactured an additional 13 guns which were not numbered in the British series.  Apart from some coastal defense batteries, none of these guns survived in service by 1939.

The Mark VI designation was given to Army QF Marks I to IV guns converted to using a bag charge with a 3-inch (7.62 cm) obturation case, some built of steel.  This modification was to reduce the need for brass cartridge cases and it was hoped to improve accuracy.  However, this gun does not appear to have been very successful.  A total of 83 guns of this type were acquired for use on minor DAMS during World War I and at least one of these was purchased by Spain in 1937, as shown in the pictures below.

An Elswick Type gun of similar design was sold to Japan in the latter part of the 19th century.  Japan obtained a license and then produced more of these weapons.  As noted above, some 37 of these were sent to Britain during World War I.  Japanese guns were redesignated as 41st Year Type on 25 December 1908.  Redesignated in centimeters on 5 October 1917.

The Italian firm of Ansaldo purchased many of these guns for secondary weapons on their armored cruisers built around 1900.  During World War II, the Italians employed a few as star-shell guns on capital ships.

Actual bore diameter of all British 4.7" guns was 4.724" (12 cm).

Unless otherwise noted, the data below is for British Mark I to IV guns.

WNBR_3pounder_m2_Furious_pic.jpg

HMS Furious in 1898
4.7"/40 (12 cm) gun in casemate
U.S. Naval Historical Center Photograph # NH 61062

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Click here for additional pictures
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Gun Characteristics
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Designation Britain
   4.7"/40 (12 cm) Elswick
   4.7"/40 (12 cm) QF Marks I, II, III, IV and VI

Italy
   120 mm/40 (4.7") Models 1889 and 1891

Japan
   4.7"/40 (12 cm) Elswick
   4.7"/40 (12 cm) 41st Year Type (Model 1908)
   12 cm/40 (4.7") 41st Year Type (Model 1908)

Ship Class Used On Britain:  Pre-dreadnoughts and cruisers of the late 1800s
Italy:  Cruisers of the late 1800s - early 1900s
Japan:  Cruisers and destroyers of the early 1900s

All 4.7" (12 cm) guns in the Royal Navy as of 1914 were Mark I to Mark IV Types

World War I
   Almost all AMCs, sloops and the rearmed destroyer Afridi
   500 guns were allocated to DAMS in September 1918

Date Of Design about 1885
Date In Service 1887 (on British ships)
Gun Weight 2.07 - 2.1 tons (2.1 - 2.2 mt)
Gun Length oa 194.1 in (4.930 m)
Bore Length 189 in (4.801 m)
Rifling Length N/A
Grooves N/A
Lands N/A
Twist N/A
Chamber Volume Marks I, II, III and IV:  284 in3 (4.66 dm3)
Mark VI:  490 in3 (8.04 dm3)
Rate Of Fire
(see Notes)
about 5 - 6 rounds per minute
Notes:

1) Quoting from a New York Times article of 26 October 1893:  "So far as is known, the Armstrong 4.724-inch gun has never attained a rapidity of fire greater than twelve rounds per minute of unaimed shots.  When aimed from a gunboat in motion, there is required for 10 rounds 1 minute and 38 seconds."  This latter figure is equivalent to about 6 rounds per minute.

2) Trials of the new 4.7"/40 (12 cm) QF guns on HMS Trafalgar in the early 1890s showed that they could fire ten unaimed shots in 80 seconds, or about 7 rounds a minute.  Nonetheless, these guns were replaced on Trafalgar and sister-ship HMS Nile with 6" (15.2 cm) QF guns in 1896 - 1897.

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Ammunition
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Type Separate
Projectile Types and Weights
(see Note 1)
Common, AP, HE, CP, Shrapnel - 45 lbs. (20.4 kg)
Bursting Charge Common - 6.84 lbs. (3.1 kg)
Others - N/A
Projectile Length N/A
Propellant Charge British
   12.0 lbs. (5.4 kg) SP
   5.44 lbs. (2.5 kg) Cord 20
   6.45 lbs. (2.9 kg) MD16

Others
   N/A

Muzzle Velocity
(see Note 2)
British
   SP - 1,786 fps (544 mps)
   Cord - 2,125 fps (648 mps)
   MD - 2,215 fps (675 mps)

Japanese
   about 2,182 fps (660 mps)

Working Pressure
(see Note 3)
For a MV of 2,100 fps (640 mps) - 12.4 ton/in2 (1,955 kg/cm2)
For a MV of 2,265 fps (690 mps) - 14.8 ton/in2 (2,333 kg/cm2)
For a MV of 2,436 fps (742 mps) - 18.0 ton/in2 (2,837 kg/cm2)
Approximate Barrel Life N/A
Ammunition stowage per gun N/A
Notes:

1) The proper shell weight for these guns was a much argued subject in Britain.  The Elswick Pattern M fired 36 lbs. (16.3 kg) projectiles, but the Mark I fired 40 lbs. (18.1 kg) projectiles.  At the Admiralty's request, this was reduced to 30 lbs. (13.6 kg) but then increased to 36 lbs. (16.3 kg), later to 40 lbs. (18.1 kg) and finally to 45 lbs. (20.4 kg).

2) These muzzle velocities are for the Mark I through Mark IV guns.  The Mark VI gun used a 6.25 lbs. (2.83 kg) MD11 charge giving it a muzzle velocity of 2,203 fps (671 mps).

3) These Working Pressure values are for an Elswick gun purchased by the USA for test purposes in 1893.  2,436 fps (742 mps) was the muzzle velocity used for proof testing.

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Range
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Elevation With 45 lbs. (20.4 kg) HE Shell
Range @ 20 degrees With MD charges - 9,900 yards (9,050 m)
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Armor Penetration with 45.0 lbs. (20.4 kg) Common Shell
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Range
Side Armor of Wrought Iron
Deck Armor
0 yards (0 m)
11.7" (297 mm)
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Note:  This data from "Getting Ready for the Test:  Heavy Calibre Rapid-Fire Guns Arrive at the Sandy Hook Proving Ground" article in The New York Times of 26 October 1893 for a muzzle velocity of 2,100 fps (640 mps).
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Mount / Turret Data
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Designation Single Mounts
   Trafalgar (6):  BDI (pre-war CP type)
   Barfleur (10):  BDII (pre-war CP type)
   Pallas (8), Scout (4), Apollo (6), Astraea (8), Eclipse (6) and Arrogant (6):  UDI and GII (pre-war CP types)
   World War I:  PIII, PIV and PIV*

   For Mark VI guns:  PVII, PVIII and CPIX

Japan
   Tone (10), Umikaze (2), Sakura (1), Urakaze (1), Kaba (1), Isokaze (4), Momo (3) and Enoki (3):  N/A

Weight  about 8 tons (8.1 mt)
Elevation BDI and BDII:  -3 / +15 degrees
Others:  -3 / +20 degrees
Elevation Rate Manually operated, only
Train Open mounts:  360 degrees
Casemate mounts:  About +30 to +150 degrees
Train Rate Manually operated, only
Gun recoil N/A
Notes:

1) The PVII was a modified Army cradle for 4" (10.2 cm) PII or PII* mountings.  The PVIII was a modified Army cradle for 4" (10.2 cm) PX mountings.  Japanese mountings were supplied with the guns.  Coastal defense mountings were generally similar to GII and PIV types.

2) Many of these guns on British warships were replaced by 6" (15.2 cm) guns during rearmament programs of the late 1890s and early 1900s.

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Data from
"Naval Weapons of World War Two" and "British Naval Guns 1880-1945 No 15" article in "Warship Volume IX" both by John Campbell
"US Naval Weapons" and "US Cruisers:  An Illustrated Design History" both by Norman Friedman
"Cruisers of the Royal and Commonwealth Navies" by Douglas Morris
"Japanese Cruisers of the Pacific War" by Eric Lacroix and Linton Wells II
"British Battleships:  1860 - 1950" by Oscar Parkes
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"Getting Ready for the Test:  Heavy Calibre Rapid-Fire Guns Arrive at the Sandy Hook Proving Ground" article in The New York Times of 26 October 1893
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Special help from Anthony G. Williams and Shane Rogers

Page History

19 October 2008 - Benchmark
03 January 2009 - Removed reference to USS New Orleans Class Cruisers
08 February 2009 - Added information about Australian guns, added information to "Ship Class Used On" section, added chamber volume of Mark VI, added British mount usage information, added information about Japanese mountings, comment about Pattern "M" on Italian ships
29 August 2011 - Added mounting information for Trafalgar and Bafleur classes
25 December 2011 - Corrected typographical error
23 September 2012 - Added picture of Italian gun
14 July 2014 - Added additional pictures datapage, use on Japanese destroyers and miscellaneous additional data