Nautical words



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Hyperacme Block. Heavy lift purchase consisting of upper sheave having a toothed disc, into which a worm engages, and a sprocket wheel of smaller diameter. Length of chain is secured to framework, passes through a single shave hook block and then into sprockets on upper shave. Worm is actuated by endless chain going over sprocket wheel secured at end of worm shaft.

Hyperbola. A curve, any point upon which has the same difference of distances between two fixed points, called loci: e.g. point X, 10 units from one locus and 8 from the other: difference 2; point Y, 13 from one locus and 11 from the other: difference 2.


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