File:Shipbuilding and Shipping Record (1916) (14597329509).jpg

Identifier: n15shipbuildings06londuoft (find matches)
Title: Shipbuilding and Shipping Record
Year: 1916 (1910s)
Authors:
Subjects:
Publisher: London
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: MSN

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than one mmute ; the lowering beingentirely under the control of one man. It is the invention ofCaptain .John Graham who has had long and intimate experience, asan officer and shipmaster, of the many shortconungs of the ordinarytwo-davit arrangement. Before being installed on the City Linevessels, the davit and gear received the approval of the Board ofTrade after exhaustive tests made at various ports throughout theUnited Kingdom. While conforming to the conventional shapethe davit is of the derrick order, lattice built, and has mountedon it simple but powerful mechanical gear which lifts, swings out andlowers the boats with great expedition and safety, as well as rapidlyrecovering the empty block, under the control of few hands comparedwith the number of hands required by the ordinary two-davitarrangement. The boats are slung centrally from one point ofsuspension—spread out however into two wtiere actual attachmentto the boat is made—and the suspending medium is a single chain,
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Lileboat Swmng Outboard by a Grabam Davit. adopting power systems, however, or even of enlisting mechanicalaid to any extent (although this is now imperative by Board ofTrade requirements as regards swinging boats outboard against alist) one outstanding and broadly marked departure from conven-tional lines consists in the use of a single davit, by which boats are.slung from the centre, instead of the ordinary two davits suspendingboats from each end. Although a departure from conventionallines the single davit is not an innovation. The general principleof centre suspension from a single derrick davit is in use in manyof our warships, and is still more extensively employed in vesselsof the American and French navies. In the present article attention is specialh dii-ected to a typeof single davit and central suspension arrangement, which for thepast two years has been in use on board several steamers ofEUermaims City Line and giving every satisfaction. This isGrahams patent single davit

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