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Early use of the water-tube boiler within the Royal Navy was controversial at times, giving rise to the 'Battle of the Boilers' around 1900. [4] These first boilers, such as the Belleville and Niclausse, were large-tube designs, with simple straight tubes of around 4" diameter, at a shallow angle to the horizontal. [5]
In sailing and boating, a vessel's freeboard is the distance from the waterline to the upper deck level, measured at the lowest point of sheer where water can enter the boat or ship. [1] In commercial vessels, the latter criterion measured relative to the ship's load line, regardless of deck arrangements, is the mandated and regulated meaning. [2]
It consists of a small board with a knotted piece of twine through the center. The observer holds one of the knots in his mouth and extends the board away so that the edges make a constant angle with his eyes. Mariner's astrolabe Derived from the astrolabe, it was developed in late 15th century and found use in the 16th to 17th centuries.
Maintaining depth in a submarine is a sophisticated task. The planesman was provided with a prominent depth gauge to monitor this, usually a circular Bourdon gauge. For precise maintenance at periscope depth an additional shallow-depth manometer, a transparent vertical pipe, would be provided too. With the development of active sonar, depth ...
The turning rotation of a vessel about its vertical/Z axis. An offset or deviation from normal on this axis is referred to as deviation or set. This is referred to as the heading of the boat relative to a magnetic compass (or true heading if referenced to the true north pole); it also affects the bearing.
Saunders-Roe first presented their idea, then designated as the SR.44, to the Air Ministry during mid-1943. Criticisms of the design were produced by Ministry officials, included the observation that the wing thickness/chord ratio was considered to be too high for a high-speed fighter when operating at a high altitude. [6]
The boat has a draft of 3.25 ft (0.99 m) with the daggerboard extended and 6 in (15 cm) with it retracted, allowing operation in shallow water, beaching or ground transportation on a trailer. [ 1 ] [ 2 ]
A rudder angle indicator is a device used to indicate the present position of the rudder blade, usually fitted near the Ship's wheel on the bridge and in the engine control room. [ 1 ] Rudder angle indicator of the MS Nordstjernen (1956) Rudder angle indicator