Newton 6-inch mortar

Newton 6-inch mortar
Newton 6-inch mortar
	; Canadian troops firing the 6-inch (152.4 mm) mortar in the open at Valenciennes in 1918;
Type	Medium mortar
Place of origin	United Kingdom
Service history
In service	1917 - 1918
Used by	; British Empire; United States
Wars	World War I
Production history
Designer	Captain H Newton, 5th Btn Sherwood Foresters;
Designed	1916
; No. built	UK : 2,538;
Specifications
; Barrel length	Bore: 4 ft 6 in (1.37 m); Total: 4 ft 9 in (1.45 m);
Shell	; HE 52 lb (24 kg);
Calibre	6 inches (152.4 mm)
Elevation	77°–45°
Rate of fire	8 rounds/min;
Effective firing range	100 - 1,420 yds; (91 - 1,298 m)
Maximum firing range	1,950 yd (1,780 m);
Filling	; Amatol, Ammonal or Sabulite
Filling weight	22 pounds (9.98 kg)

British mortar weapon

The Newton 6-inch mortar was the standard British medium mortar in World War I from early 1917 onwards.

Description[edit]

The Newton 6-inch replaced the 2-inch medium mortar beginning in February 1917.

It was a simple smooth bore muzzle-loading mortar consisting of a 57-inch (1,448 mm) one-piece steel tube barrel, with a "striker stud" inside the centre of the closed base of the tube. The rounded external base of the tube sat in a socket in the flat cast steel base, which in turn sat on a wooden platform. An "elevating guy" (cable) connected to a loop in the upper side of the barrel and the rear end of the bed. "Traversing guys" (cables) connected to loops on each side of the barrel and eyebolts on the upper sides of the bed. Hence aiming of the barrel was done by adjusting the length of the guys via adjusting screws. A socket in the barrel base allowed for emergency firing via a "misfire plug" in the case of misfires (i.e. if the bomb remained in the barrel due to failure of the propellant to ignite).^[6]

Combat service[edit]

Loading bomb in a typical trench emplacement, Mesopotamia 1918

British Empire divisions were initially equipped with three batteries of four mortars designated X, Y and Z. From February 1918 onwards, these were consolidated into two batteries, X and Y, of six mortars each, and Z was dissolved. In British use, they were operated by the Royal Field Artillery and formed part of the divisional artillery, with one battery attached to each of the divisional artillery brigades.

The United States Army began production and equipping with this mortar late in the war but it is doubtful whether any were used in combat.

3rd Australian Medium Trench Mortar Battery in action, Ville-sur-Ancre, Somme, 29 May 1918

The mortar was operated from concealed pits close to the front line during trench warfare, and was used in the open during the final "mobile warfare" phase of the First World War, depending on available transport. The disassembled weapon was usually transported on horsedrawn carts but the Canadian Automobile Machine Gun Brigade (the Canadian Independent Force or "Brutinel's Brigade") is known to have successfully used the mortar both mounted on motor trucks and dismounted in the closing months of the war.^[7]^[8]

The 52-pound cast-iron fin-stabilised high explosive bomb carried the percussion primer at the base in the intersection of the four vanes (fins), consisting of a specially loaded blank .303 rifle cartridge. The basic propellant charges were contained in four small white cambric bags each containing 1 oz of guncotton yarn. These were held in place in the four angles between the bomb's fins. For ranges less than 1000 yards, one or more bags could be removed, as per range tables.

For ranges above 1,000 yards (910 m), additional charges were loaded before the bomb, held in two white cambric bags each containing 1 oz 4 drm of cordite.^[9]

In action the gunners would adjust the angle of the barrel via the elevating guy (for distance) and traversing guys (for direction). The manual warns: "See that the elevating and traversing screws of the guys are always tight. A slack guy leads to inaccurate shooting, and the stresses on firing are not equally distributed; this is usually the cause of the guys breaking".^[10]

The range tables specified the barrel angle and propellant charges required. The additional cordite propelling charge bags were dropped down the barrel if necessary, or necessary number of propellant charges removed from the bomb, and the bomb's fuze was set. The gunners stood back, the bomb was dropped down the barrel, the detonator in the base of the .303 cartridge in the base of the bomb struck a pin in the bottom of the barrel and fired, igniting the guncotton charges in the base of the bomb, which in turn ignited the cordite charges if present. The resulting rapid gas expansion propelled the bomb up the barrel and to its target.

1917 range tables[edit]

52 lb bomb, ML 6-inch trench mortar

Propellant : 1-4 one ounce guncotton charges in the base of the bomb, plus an optional 2.5 oz cordite charge.^[11]

Range (yards)	1 oz charge degrees	2 oz charge degrees	3 oz charge degrees	4 oz charge degrees	4 oz + 2.5 oz cordite
Range (yards)	1 oz charge degrees	2 oz charge degrees	3 oz charge degrees	4 oz charge degrees	degrees	seconds
100	77
120	74
140	71
160	67.5
180	63.5
200	59
220	47.5	77.25
226	45
240		76
260		74.75
280		73.25
300		72
320		70.5	77.5
340		69	76.75
360		67.5	76
380		66	75
400		64.25	74.25
420		62.25	73.25
440		60.25	72.25	77.25
460		57.75	71.5	76.5
480		55	70.5	76
500		50.5	69.5	75.25
510		45
520			68.5	74.5
540			67.5	74
560			66.25	73.25
580			65.25	72.5
600			64	72
620			62.75	71.25
640			61.25	70.5
660			59.75	69.75
680			58.25	69
700			56.5	68.25	75.25	23.9
720			54.5	67.5	74.75	23.9
740			51.75	66.75	74.25	23.8
760			45.5	65.75	73.75	23.8
761			45
780				65	73.25	23.7
800				64	72.75	23.6
820				63.25	72.25	23.6
840				62.25	71.75	23.5
860				61	71.25	23.4
880				60	70.75	23.4
900				58.75	70.25	23.3
920				57.5	69.75	23.2
940				56	69.25	23.1
960				54.5	68.75	23.1
980				52.5	68.25	23.0
1000				50	67.5	22.9
1016				45
1020					67	22.8
1040					66.5	22.7
1060					66	22.6
1080					65.25	22.5
1100					64.5	22.8
1120					64	22.2
1140					63.25	22.1
1160					62.75	22.0
1180					62	21.8
1200					61.25	21.7
1220					60.5	21.5
1240					59.5	21.3
1260					58.75	21.1
1280					57.75	20.9
1300					56.75	20.7
1320					55.75	20.4
1340					54.75	20.2
1360					53.5	19.9
1380					52	19.5
1400					50	19.0
1420					45	17.5

Image gallery[edit]

Men of the 9th Btn Royal Sussex Regiment and mortar bomb dump near Lens, September 3, 1918

Mk III bomb diagram

Bomb at Hawthorn Crater, Somme 1998.

Surviving examples[edit]

Army Memorial Museum, Waiouru, New Zealand

Royal Australian Artillery Museum, North Head, Sydney, Australia

Australian Army Infantry Museum, Singleton NSW Australia

Jonesborough-Washington County History Museum, Jonesborough, Tennessee - Displayed previously in the town square, now part of the Historical Society collection. Produced by Hadfields of Sheffield, England. Unknown how it came to reside in Tennessee.

Notes and references[edit]

^ Ministry of Munitions 1922, pages 130-131

^ Preliminary Notes on the M.L. 6-Inch Trench Mortar Mark I. 1917

^ 52 lb total weight for bomb is quoted in Range Tables. Preliminary Notes on the M L 6-inch Trench Mortar, Mark I. Handbook of the M L 6-inch Trench Mortar Mark I.

^ Ministry of Munitions 1922, page 66

^ A maximum range of 1,950 yards was eventually achieved after improvements. Ministry of Munitions 1922, page 66

^ Preliminary Notes on the M.L. 6-Inch Trench Mortar, Mark I, 1917, page 1

^ Michael Holden, University of New Brunswick, "Training, Multi-National Formations, and Tactical Efficiency: The Canadian Motor Machine Gun Brigades in 1918"

^ Danish Military History Society, "The Canadian Motor Machine Gun Brigade, Part 1"

^ Handbook of the M.L. 6-Inch Trench Mortar Mark I. 1918

^ Handbook of the M.L. 6-Inch Trench Mortar Mark I. 1918, page 10

^ Preliminary Notes, 1917

Bibliography[edit]

Preliminary Notes on the M.L. 6-Inch Trench Mortar Mark I. 1917. War Office, UK.

Handbook of the M.L. 6-Inch Trench Mortar Mark I. 1918. War Office, UK.

W L Ruffell, "An example of Kiwi ingenuity. A carriage designed by the Divisional Trench Mortars to meet the changed conditions of fighting in the last advances of 1918"

Handbook of artillery : including mobile, anti-aircraft and trench matériel (1920). United States. Army. Ordnance Dept, May 1920

"History of the Ministry of Munitions", 1922. Volume XI, Part I Trench Warfare Supplies. Facsimile reprint by Imperial War Museum and Naval & Military Press, 2008 .mw-parser-output cite.citation{font-style:inherit}.mw-parser-output .citation q{quotes:"""""""'""'"}.mw-parser-output .citation .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .citation .cs1-lock-limited a,.mw-parser-output .citation .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .citation .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/4/4c/Wikisource-logo.svg/12px-Wikisource-logo.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-maint{display:none;color:#33aa33;margin-left:0.3em}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}
ISBN 1-84734-885-8

External links[edit]

Imperial War Museum Collection Search Weaponry Inventions and Improvements by Captain H Newton during the First World War a manuscript detailing Captain Newton's work on this and other weapons, written by his nephew and held by the Imperial War Museum.

"Provisional drill regulations for trench mortar batteries; 6" Newton and the 240 mm. : chapters II, VI, and VIII". United States. War Dept, 1918. Made available online by Combined Arms Research Library

"Handbook on trench mortar fuzes, Mark VII and Mark VII-E.". United States. War Dept, 1918. Made available online by Combined Arms Research Library

"Manual for trench artillery, United States Army (provisional). Part I, trench artillery.". United States. War Dept, July 1918. Made available online by Combined Arms Research Library

"Manual for trench artillery, United States Army (provisional). Part II, formations and maneuvers". United States. War Dept, 1918. Made available online by Combined Arms Research Library

WL Ruffell, The 6-inch Mortar from "The Mortar"

6-inch Newton Mortar at Landships

[1] Ministry of Munitions 1922, pages 130-131

[2] Preliminary Notes on the M.L. 6-Inch Trench Mortar Mark I. 1917

[3] 52 lb total weight for bomb is quoted in Range Tables. Preliminary Notes on the M L 6-inch Trench Mortar, Mark I. Handbook of the M L 6-inch Trench Mortar Mark I.

[4] Ministry of Munitions 1922, page 66

[5] A maximum range of 1,950 yards was eventually achieved after improvements. Ministry of Munitions 1922, page 66

[6] Preliminary Notes on the M.L. 6-Inch Trench Mortar, Mark I, 1917, page 1

[7] Michael Holden, University of New Brunswick, "Training, Multi-National Formations, and Tactical Efficiency: The Canadian Motor Machine Gun Brigades in 1918"

[8] Danish Military History Society, "The Canadian Motor Machine Gun Brigade, Part 1"

[9] Handbook of the M.L. 6-Inch Trench Mortar Mark I. 1918

[10] Handbook of the M.L. 6-Inch Trench Mortar Mark I. 1918, page 10

[11] Preliminary Notes, 1917

v t e British Empire artillery of the First World War
Tank guns	QF 6-pounder Hotchkiss QF 6-pounder 6 cwt
Infantry guns	1.59-inch Breech-Loading Vickers Q.F. Gun, Mk II
Field artillery	BL 12-pounder 6 cwt QF 12-pounder 8 cwt QF 12-pounder 18 cwt QF 13-pounder BL 15-pounder BLC 15-pounder QF 15-pounder QF 18-pounder QF 4-inch gun Mk III BL 4-inch gun Mk VII QF 4.5-inch howitzer
Medium & heavy artillery	QF 4.7-inch gun BL 5-inch howitzer BL 5.4-inch howitzer BL 60-pounder gun BLC 6-inch siege gun BL 6-inch gun Mk VII BL 6-inch gun Mk XIX BL 6-inch 26 cwt howitzer BL 6-inch 30 cwt howitzer BL 8-inch howitzer Mk I – V BL 8-inch howitzer Mk VI – VIII
Siege artillery	BL 7.5-inch Mk III naval gun BL 9.2-inch howitzer BL 9.2-inch Mk X naval gun BL 12-inch howitzer BL 12-inch Mk X naval gun BL 15-inch howitzer
Mountain artillery	RML 2.5-inch mountain gun BL 10-pounder mountain gun BL 2.75-inch mountain gun QF 2.95-inch mountain gun QF 3.7-inch mountain howitzer
Mortars	Garland trench mortar 3-inch Stokes mortar Vickers 1.57-inch mortar 2-inch medium mortar Newton 6-inch mortar 9.45-inch Heavy Mortar
Smoke and chemical weapons	4-inch Stokes Mortar Livens Projector Livens Large Gallery Flame Projector
Anti-aircraft guns	QF 1-pounder pom-pom QF 2-pounder "pom-pom" Mk II 75 mm AA gun QF 12-pounder 12 cwt QF 13-pounder 6 cwt QF 13-pounder Mk IV QF 13-pounder 9 cwt QF 3-inch 20 cwt QF 18-pounder QF 4-inch Mk V
Coastal artillery	QF 12-pounder 12 cwt QF 4-inch naval gun Mk I – III BL 6-inch Mk VII naval gun BL 9.2-inch Mk IX – X naval gun RML 9-inch
Railway guns	BL 9.2-inch railway gun BL 12-inch railway gun BL 12-inch railway howitzer BL 14-inch railway gun

搜尋此網誌

Dtyjlui