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Over time, log construction standardized. The shape is a quarter circle, or quadrant with a radius of 5 inches (130 mm) or 6 inches (150 mm), [1] and 0.5 inches (13 mm) thick. [1] The log-line attaches to the board with a bridle of three lines that connect to the vertex and to the two ends of the quadrant's arc.
Figure 1: Photo of World War II US Navy submarine pitometer. This unit uses a mercury-based manometer to measure the difference in static and dynamic water pressure. Pitometer logs (also known as pit logs) are devices used to measure a ship's speed relative to the water. They are used on both surface ships and submarines.
Over the course of the 1950s, B&G, then based in Lymington on the south coast of England, extended its activities into echo sounders and in 1960 produced its first speedometer. In 1966 the ketch Gypsy Moth IV , the yacht which earned Sir Francis Chichester his single-handed circumnavigation record, was equipped with a full suite of B&G instruments.
A speedometer or speed meter is a gauge that measures and displays the instantaneous speed of a vehicle. Now universally fitted to motor vehicles, they started to be available as options in the early 20th century, and as standard equipment from about 1910 onwards. [1]
Surfaced submarines entering and leaving port navigate similarly to traditional ships but with a few extra considerations because most of the boat rides below the waterline, making them hard for other vessels to see and identify. Submarines carry an inertial navigation system, which measures the boat’s motion and constantly updates position ...
An engine order telegraph or E.O.T., also referred to as a Chadburn, [1] is a communications device used on a ship (or submarine) for the pilot on the bridge to order engineers in the engine room to power the vessel at a certain desired speed.