Bliss-Leavitt Mark 4 torpedo

Bliss-Leavitt Mark 4 torpedo
Type	Anti-surface ship torpedo
Place of origin	United States
Service history
In service	1908–1922
Used by	United States Navy
Production history
Designer	Frank McDowell Leavitt
Designed	1908
Manufacturer	E. W. Bliss Company
No. built	100
Variants	Mod 1
Specifications
Weight	approximately 1500 pounds
Length	197 inches (5.0 meters)
Diameter	17.7 inches (45 centimeters)
Detonation mechanism	War Nose Mk 1 contact exploder
Engine	Vertical turbine
Guidance system	gyroscope
Launch platform	submarines

The Bliss-Leavitt Mark 4 torpedo was a Bliss-Leavitt torpedo developed and produced by the E. W. Bliss Company in 1908. It was the first American-built torpedo specifically designed to be launched from a submarine. About 100 Mark 4s were purchased for experimental purposes by the United States Navy, which led to design improvements to the gyro and the reducing valve. The Mark 4 and all other torpedoes designed before the Bliss-Leavitt Mark 7 torpedo, were considered obsolete and withdrawn from service in 1922.