1.5-pdr [37 mm/43 (1.46")] Mark I
Updated 28 November 2015

A light AA gun used during World War I.  Does not appear to have been very successful, as none survived in service by 1939.  Some of these guns were exported to Austria-Hungary before 1914.

HMS Undaunted
This ship carried two 1.5-pdr weapons in 1918
NMM Photograph

Other images at The Vickers Photographic Archive

Mark I Mounting:  2833 and 2834
Mark II Mounting:  4886

Gun Characteristics
Designation Vickers 1.5-pdr Mark I
Ship Class Used On British:  A few cruisers
Austria-Hungary:  Erzherzog Karl, Sankt Georg and Monarch classes
Date Of Design about 1910
Date In Service 1914
Gun Weight 126 lbs. (57 kg)
Gun Length oa N/A
Bore Length 62.8 in (1.595 m)
Rifling Length N/A
Grooves N/A
Lands N/A
Twist N/A
Chamber Volume N/A
Rate Of Fire N/A
Type Fixed
Weight of Complete Round HE - N/A
Projectile Types and Weights HE - 1.5 lbs. (0.7 kg)
Bursting Charge 0.16 lbs. (0.07 kg)
Projectile Length N/A
Propellant Charge N/A
Muzzle Velocity HE - 2,100 fps (640 mps)
Working Pressure N/A
Approximate Barrel Life N/A
Ammunition stowage per gun N/A
Range @ 45 degrees about 2,000 yards (1,830 m)
AA Ceiling N/A
Mount / Turret Data
Designation Pedestal Mount Mark I and Mark II
Weight  N/A
Elevation -5 / +80 degrees
Elevation Rate Manually operated, only
Train 360 degrees
Train Rate Manually operated, only
Gun recoil N/A
Note:  The Mark I was a free-standing mount operable by a single crewman while the Mark II was a two-man mounting with seats for the trainer and pointer.
Data from
"World Warships in Review 1860-1906" by John Leather
"British Cruisers of World War Two" by Alan Raven and John Roberts
Tony DiGiulian's personal data files
Special help from Daniel Muir
Page History

05 September 2006 - Benchmark
07 December 2011 - Updated to latest template
28 November 2015 - Changed Vickers Photographic Archive links to point at Wayback Archive