This is an authentic WW2 Sperry Gyro-Compass Repeater, Mark 15, Mod. 0. Although this device was patented at the end of WWI (1919), these models were heavily produced and utilized as standard equipment by Allied forces and the US Navy throughout World War II and into the Korean War era. They were deployed extensively on naval ships, including destroyers, submarines, aircraft carriers, and cruisers.
Specifications:
Patent Date: March 4, 1919.
Manufacturer: Sperry Gyroscope Company, Inc. (Brooklyn/New York). During high-demand wartime periods, companies like Chrysler's Dodge Division were also licensed to build this model.
Measurements (approximate):
Diameter: 9 3/4"
Weight: 23 lbs
This particular piece was housed on the SS Council Bluffs Victory, a World War II cargo ship built by the California Shipbuilding Corporation (CalShip) in Wilmington, California. Christened by the California governor's wife, it famously became the very last Victory ship produced by the shipyard when it was launched on September 27, 1945.
Ship Details:
Class: Victory ship (VC2-S-AP2)
Length: 455 feet
Width (Beam): 62 feet
Gross Tonnage: 7,607 tons
Ship History:
Built to replace cargo lost to submarines, she missed active WWII combat but was used to return American soldiers home. She was later sold to the Netherlands and sailed for the Holland America Line under the name SS Axeldijk. She sailed under the Liberian flag as the SS Monique before she was ultimately broken down for scrap in Taiwan in 1971.
Design & Mechanics:
Unlike a traditional magnetic compass, a gyro-compass finds and tracks True North rather than magnetic north. It accomplishes this by harnessing the physical laws of a fast-spinning gyroscope wheel, gravity, and the Earth's rotation. Because it is immune to magnetic interference, it was invaluable on steel-hulled combat ships. This specific instrument is a repeater, meaning it does not house the heavy, central master gyroscope itself. Instead, it was synchronized electronically via an amplifier system to mirror the directional readouts of the master compass. Multiple repeaters were distributed around vital locations of a ship, such as the bridge, conning towers, and fire control stations.
The dial configuration is an 8-inch gimbaled dial featuring prominent block-letter cardinal directions (N, S, E, W) and inter-cardinal points (NE, SE, NW, SW). The outer ring has a precise 0–360 degree scale used for detailed navigational plotting. It's housed in a heavy, machined metal bezel secured with outer rim screws to withstand heavy sea vibrations. Internal wiring originally allowed the face to be backlit for nighttime navigation.
