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Richard Hakluyt, The Principal Navigations, Voyages, Traffiques, and Discoveries of the English Nation 11 11 Browse Search
Harper's Encyclopedia of United States History (ed. Benson Lossing) 5 5 Browse Search
Knight's Mechanical Encyclopedia (ed. Knight) 3 3 Browse Search
George Bancroft, History of the Colonization of the United States, Vol. 1, 17th edition. 2 2 Browse Search
Pliny the Elder, The Natural History (ed. John Bostock, M.D., F.R.S., H.T. Riley, Esq., B.A.) 1 1 Browse Search
James Russell Lowell, Among my books 1 1 Browse Search
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Browsing named entities in Knight's Mechanical Encyclopedia (ed. Knight). You can also browse the collection for 1593 AD or search for 1593 AD in all documents.

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Knight's Mechanical Encyclopedia (ed. Knight), R. (search)
he case may be, moving in a circular path or rotating on its own proper axis. Some of these are considered under centrifugal pump (see pages 514-516). The more common form of rotary pump is that in which the piston or pistons rotate on an axis, as seen in the illustrations, Fig. 4465. a is a double-wheel pump from the old collection of Serviere. The cog-wheels rotate in contact with each other, the teeth of each filling the interdental spaces of the opposite. Serviere was born at Lyons, 1593. See also Ramelli's book, sixteenth century. b is Eve's rotary pump, 1825. It has three pistons on a hub, and a rotating abutment, which offers a depression to enable the pistons to pass as they are successively presented. c has a hub with one piston, and a curved flap which turns on a hinge. In d the pistons are cam-shaped, and the vertical valve which forms the abutment rises on the cam, and then shuts down behind it, to rise again on the next cam. e has a sliding valve which
Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
s had elapsed, was found by Alberti (sixteenth century) to consist of pine and cypress in excellent preservation, which, besides a coating of black pitch, had a double covering of canvas glued on, and over it a sheathing of lead fastened with brass nails. In 1613, a junk of 800 or 1,000 tons was seen by European navigators in Japan, entirely sheathed with iron. European vessels were first sheathed with copper in the seventeenth century. In Sir Richard Hawkins's voyage to the South sea, 1593, various kinds of sheathing to prevent the ravages of the teredo are mentioned. In Spain, very thin sheets of lead were used, but were not durable; canvas had been tried, but unsuccessfully. He recommends charring the outside of the planks and coating them with pitch or tar. In China a kind of varnish was employed. He also speaks of a compound of pitch and glass. His father had invented the best method then used in England; it consisted of two thicknesses of extra planking, between which
Knight's Mechanical Encyclopedia (ed. Knight), T. (search)
Ther′mo-scope. An instrument for indicating relative differences of temperature. The term was applied by Count Rumford to an instrument invented by him, and similar in principle to the differential thermometer of Professor Leslie. See differential thermometer. See also Fig. 6360. Any instrument which shows variations of temperature, whether or not it indicates the actual differences, is sometimes called by this name, including the thermometer. Such were those of Galileo, who in 1593 constructed thermoscopes, which were dependent concurrently on changes of temperature and on variations in the pressure of the external air. These were probably similar to the aerometers of the Spanish Saracens. See Aerometer. As early as 1641 observations of temperature were made at regular intervals with spirit-thermometers similar to our own. Barker and Mayer's thermoscope, August 26, 1873, is designed to indicate in a manner to be readily discernible to the eye the existence of ex