HISTORY OF MARINE ARCHITECTURE.

J23

beam placed vertically in the vessel, and erected merely to answer the purposeof supporting the corvus, when the kb^xix was hoisted on the mast itself: theiron weight, indeed, to which particular part of the engine the name of corvusmost properly belonged, was armed in addition with a number of hooks', inconsequence of which, it answered not only the purpose of annoyance, butthat of grappling also. The description of this engine, according to Polybius,was as follows :-

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“ A round spar, four ells in length, and three palms in diameter, was fixedupright on the prow of the vessel: to the top of it was attached a block, orpulley; a rope passing through which served to sustain a sort of turning bridge,formed of planks. It was four feet in width, and six ells in length, nailedtogether, and forming a platform, through the middle of which an oblongaperture admitting the beam to pass, it turned round it as on a centre. The

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