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RUDDER (O.E. Rather, i.e. rower)

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Originally appearing in Volume V23, Page 814 of the 1911 Encyclopedia Britannica.
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RUDDER (O.E. Rather, i.e. rower)  , that See also:part of the steering apparatus of a See also:ship which is fastened to the stern outside, and on which the See also:water acts directly . The word may be found to be used as if it were synonymous with " helm." But the helm (A.S . Hillf, a handle) is the handle by which the See also:rudder is worked . The tiller, which is perhaps derived from a provincial See also:English name for the handle of a See also:spade, has the same meaning as the helm . In the earliest times a single See also:oar, at the stern, was used to See also:row the See also:vessel See also:round . In later times oars with large See also:blades were fixed on the sides near the stern . In See also:Greek and See also:Roman vessels two sets were sometimes employed, so that if the pitching of the ship lifted the after pair out of the water, the foremost pair could still See also:act . As these See also:ancient See also:ships were, at least in some cases, See also:sharp at both ends and could See also:sail either way, See also:steer (or steering) oars were fixed both fore and aft . The steer oar in this See also:form passed through a See also:ring on the See also:side and was supported on a crutch, and was turned by a helm, or tiller . Norse and See also:medieval vessels had, as far as we can See also:judge, one steer oar only placed on the right side near the stern—hence the name "starboard," i.e. steerside, for the right side of the ship looking forward . In the See also:case of small vessels the steer oar possesses an See also:advantage over the rudder, for it can bring the stern round quickly . Therefore it is still used in whaling boats and See also:rowing boats which have to See also:work against See also:wind and See also:tide, and in surf when the rudder will not act .

It is not possible to assign any date for the displacement of the side rudder by the stern rudder . They were certainly used together, and the second displaced the first in the course of the 14th See also:

century when experience had shown that the rudder was more effective at the stern than at the side . The rudder of a wooden ship when fully See also:developed was composed of four pieces . The first or See also:main piece was hung on to the stern See also:post of the ship . Its upper portion was known as the rudder See also:head, and was at first an See also:oval See also:shaft which passed into the ship through the rudder See also:port, and to which the helm was fixed . A See also:canvas bag called a rudder coat covered the opening to exclude the water . In later days See also:Sir R . See also:Seppings introduced the cylindrical form in See also:order to prevent the water from coming into the round rudder port . Three back pieces were fastened to the main piece longitudinally . The whole were fastened together by See also:iron bands called pintle straps, which had at the forward end a See also:pin or pintle, which fitted into braces, i.e. fixed rings on the stern post, so that the rudder hung on hinges . The See also:lower part of the main piece was bevelled, and so was the stern post, so as to ;flow the rudder to See also:swing freely . A projecting piece called a chock or See also:wood-See also:lock was fixed in the head outside the ship in order to prevent the rudder from being lifted by the water out of its hinges .

A small vessel can be steered by the helm or tiller, but in a larger it is necessary to apply a See also:

mechanical leverage . This was secured by carrying See also:ropes, or in later times chains, to the sides of the ship, and then through blocks to the upper See also:deck, round a See also:barrel which is worked by the See also:wheel . The principle of the rudder cannot alter, but the means employed to work it have been altered by the introduction of the See also:screw, and by the increased See also:size of ships . A single screw is placed in an open space before the stern post . As the opening thus created prevents the water from flowing directly on to the rudder, a screw steamer is sometimes difficult to steer . In order to make the rudder more manageable, it has been balanced, i.e. pivoted, on a shaft placed at about a third of its length from the foremost edge . In a See also:double screw there is no opening, but the balanced rudder is still used, and the ship can be turned by See also:reversing one of the screws . The need for more See also:power to work the helm has led to the introduction of See also:steam, and See also:hydraulic steering apparatus which can be set in See also:motion by a small wheel . See See also:Burney's See also:Falconer's See also:Dictionary (See also:London, 183o) ; Torr's Ancient Ships (See also:Cambridge, 1894); See also:Nares, See also:Seamanship (See also:Portsmouth, 1882) .

End of Article: RUDDER (O.E. Rather, i.e. rower)
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