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Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
ionary of Greek and Roman Antiquities, p. 783 et seq. A. D. 1500. The Great Harry, constructed by Henry VII., was the first ship of the English royal navy. Previous to this the navy consisted of vessels furnished by certain maritime towns. 1515. The Henry Grace de Dieu, of 1,000 tons and 122 guns, mostly of small caliber, was built under the orders of Henry VIII. It was a sea-going failure The Caracon, built by Francis I., ditto. 1603. The English navy consisted of 42 ships. 1ch was lifted by the key. The keys were arranged as in the modern piano. It probably had catgut strings at first, but afterward had about 30 brass wires for the lower notes and 20 steel ones for the upper. It was used in France as early as A. D. 1515. The illustration q, Plate XL. page 1692, is from Bonanni's Gabinetto Armonico, 4to, Rome, 1722. The spinet was always triangular, and occupied a place in point of time between the virginal and the harpsichord. Unlike the former, its strings
Knight's Mechanical Encyclopedia (ed. Knight), T. (search)
ng it by steam-power in the direction contrary to its natural motion as a water-wheel forms the centrifugal or centripetal pump, according to whether the turbine be on the inward or the outward flow principle. See centrifugal pump; cen-Tripetal pump; propeller pump, Fig. 3977. Ruthven's English patent of 1849, for a hydraulic ship propeller, acting by a steam-driven turbine-wheel, ejecting the water aft, was tried in 1866 on the Water-Witch. It was termed the nautilus propeller (see page 1515). See also hydraulic propeller, pages 1149, 1150. Several tables have been constructed to indicate the powers and rates of wheels of varying diameters under different heads. They contain the sizes of the wheels in inches of diameter: the head in feet; the cubic feet of water per minute; the number of revolutions per minute; the horse-power. Tur′bine-dyna-mom′e-ter. See testing-machine, Fig. 6331. Tur′bine-pump. A form of pump, — the turbine reversed. It is driven by power,