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Knight's Mechanical Encyclopedia (ed. Knight), C. (search)
— Pepys's Diary, 1664. The pendulum, which engaged the attention of the Spanish Saracens in the eleventh century, and persons of other nations who were so fortunate as to visit their University of Cordova, had a sleep of six centuries, for it was reserved for the seventeenth century to bring it into general notice and usefulness. Early in the seventeenth century, Galileo, observing the oscillations of a suspended lamp, conceived the idea of making a pendulum a measurer of time, and in 1639 published a work on mechanics and motion, in which he discussed the isochronal properties of oscillating bodies suspended by strings of the same length. A. D. 1641, Richard Harris constructed a pendulum clock in London, for the church of St. Paul, Covent Garden. A. D. 1649, a pendulum clock was constructed by Vincenzio Galileo (the younger Galileo). A. D. 1650, Huyghens constructed clocks on this principle: — He first explained the nature, properties, and application of the pendulum,
Knight's Mechanical Encyclopedia (ed. Knight), W. (search)
ed. Stereotype or electrotype impressions are obtained from wood by the usual process of molding in plaster of Paris and subsequent casting, or brushing with graphite and electro deposit. Woodcuts have also been multiplied by molding with warm gutta-percha, and then taking a cast of the same gum, to be used as a woodcut in the printing-press. Wood′en leg. Inepte, frustra crure lingneo curres. — Martial, X. c. 6. See leg, artificial. Wood′en Pave′ment. See pavement, pages 1639-1642, and Plate XXXVIII. The experience of American cities which have used woodpavement goes to show that some system of preservation is necessary to secure a durable wood-pavement. If the question of wood-preservation is not finally and perfectly solved, it must be admitted that the methods now in use show a decided progress in that direction. The respective efforts tend to neutralize the external influences of water, air, and heat, by. First. A more or less complete removal of t