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Knight's Mechanical Encyclopedia (ed. Knight), A. (search)
focus shall coincide with the place of the image, consequently rays diverging from any point on the image, and falling on the lens C D, are rendered parallel and enter the eye at E, where they produce distinct vision. The length of the telescope is equal to the sum of the focal distances of the two lenses, and the magnifying power is equal to the focal length of the object-glass divided by the focal length of the eye-glass. This telescope was first described by Kepler in his Dioptrice, 1611, but does not appear to have been executed till 20 or 30 years later. Cooke's telescope. A large instrument of its class was mounted at York, England, by Cooke. See Fig. 401. It is mounted equatorially on the German principle, having a finder at the side, as is usual with that class of instruments. Sidereal motion is communicated to the instrument by clock-work. Its objectglass is 25 inches in diameter. The new refracting instrument for the Naval Observatory of Washington, D.
Knight's Mechanical Encyclopedia (ed. Knight), F. (search)
s supposed to have been brought from the East by a returning crusader. Voltaire says that they were used by the Lombards in the fourteenth century; and Martius states that they were common in Italy in the fifteenth century. Table-forks are heard of in Italy from 1458 to 1490. An Italian at the court of Matthias Corvinas, king of Hungary, notices the lack of the fork in the table furniture of the king. A century after, they were not known in France or Sweden. Coryat, in his Crudities, 1611, says: I observed a custom in all those Italian cities and towns through which I passed, that is not vsed in any other country that I saw in my traules, neither doe I think that any other nation in Christendome doth vse it, but only Italy. The Italians and also most strangers that are commorant in Italy, doe alwaies at their meales vse a little fork when they cut their meat. Fyne Moryson's. Itinerary, in the reign of Elizabeth, refers to their use in Venice. Heylin in his Cosmograph, 1
Knight's Mechanical Encyclopedia (ed. Knight), M. (search)
ets. v is a mallet made of thicknesses of raw-hide firmly pressed together by the center bolt. w has a rubber body upon a metallic skeleton. 2. (Nautical.) a. A calking-mallet is one used with a calking-chisel or making-iron to drive oakum into the seams of a vessel. b. A serving-mallet is a cylindrical block of wood, by which spun-yarn is tightly coiled around a hawser or rope. 3. (Dentistry.) A plugger for compacting filling in carious teeth. See dental-plugger, Figs. 1610, 1611. 4. A striker for balls in games. A croquet mallet. The electric mallet, in which the impulse is given by means of a galvanic circuit acting upon a magnet to oscillate an armature, or to move the magnet itself to and from an armature which forms the punch, is described under plugger. 5. (Surgical.) A hammer used with a gouge in cutting bones. Malm-bricks. The name given to those bricks, made in the neighborhood of London, in which the clay is pulped, mixed with cream of lime,
Knight's Mechanical Encyclopedia (ed. Knight), T. (search)
hardened by plunging in cold water, and afterward tempered at the heat at which grease inflames. Table-grinder. Ta′ble-grind′er. A form of grinding-bench. Ta′ble-knife. Sharon Turner ( History of the Anglo-Saxons ) observes, that in all ancient pictures of eating, etc., knives are seen in the hands of the guests, but no forks. Their use at table was, no doubt, coeval with that of the table itself. Forks are of very modern introduction. Coryatt, in his Crudities, published 1611, says: I obserued a custome in all those Italian cities and townes through which I passed that is not vsed in any other country that I saw in my traules, neither doe I think that any other nation of Christendome doth vse it, but only Italy. The Italians and also most strangers that are commorant in Italy, doe alwaies at their meals vse a little forke when they cut their meate. For while with their knife, which they hold in one hand, they cut their meate out of the dish, they fasten their fo<