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Knight's Mechanical Encyclopedia (ed. Knight), C. (search)
is revolved. The connections between the pumping-engines and the pumps may be readily uncoupled, and the capstan thrown into gear with said engines. A regulating-screw is combined with Steam-capstan. the friction-clutch, which throws the capstan into gear with the engines, so that the effect of said clutch, respecting the power or speed of the capstan, may be varied. In moving the mass of granite, weighing 1,500 tons, and used as a pedestal for the statue of Peter the Great, in St. Petersburg, Count Carbury used capstans, the fall passing to pulley-blocks, which were secured respectively to the load and to posts set firmly in the ground. When Vitruvius moved the columns of the Temple of Diana at Ephesus from the quarry to the site, he inserted an iron pin into each end of the column, and to this attached a quadrilateral as long and wide as the column. Oxen were attached to the frame, and the column rolled along on the ground. This was the method devised by Ctesibus of Al
Knight's Mechanical Encyclopedia (ed. Knight), E. (search)
of a thunder-cloud. Similar experiments were repeated throughout Europe, and in 1753 Richman was instantly killed at St. Petersburg by a discharge from a rod of this kind. The more important discoveries since those days relate rather to electricitro-magnetic engines have also been invented by Wheatstone, Talbot, Hearder, Hjorth, and others. Professor Jacobi of St. Petersburg, in 1838-39, succeeded in propelling a boat upon the Neva at the rate of four miles an hour, by means of a machine onved instrument for operating upon depressed portions of the skull was disinterred at Pompeii, 1819, by Dr. Cavenke of St. Petersburg. El′e-vator—buck′et. One of the grain-cups on the traveling belt of the elevator. El′io-type. （Photograom the gullet. An esophagus-forceps, with bent shank, was found in 1819, in a house in Pompeii, by Dr. Savenko, of St. Petersburg. It is pictured in Smith's Dictionary of Antiquities, p. 274. Es-pal′ier. （Agriculture.) A trellis fo
Knight's Mechanical Encyclopedia (ed. Knight), I. (search)
has an oblong frame, upon the front side of which is affixed a cutting-edge of steel. From the forward end a tongue projects, and from the rear a guiding-pole with a bent knee, composed of a metallic rod that runs upon the ice. A wide board is adjusted to the front side of the frame for removing snow. Ice-locomotive. Ice-lo-co-mo′tive. A traction engine for running on ice; one constructed by Messrs. Neilson of Glasgow, and employed for conveying passengers and freight between St. Petersburg and Cronstadt, has two driving-wheels five feet in diameter and studded with spikes. The front part rests on a sledge, which is swiveled and may be turned by the wheel, which has an endless screw working a pinion that turns a segment rack attached to the sledbody. The cylinders are 10 inches in diameter and 22 inches stroke. The weight of the engine is 12 tons, and it attains a speed of 18 miles an hour. Ice-mak′ing. Evaporation, radiation, liquefaction, and sudden reduction o
Knight's Mechanical Encyclopedia (ed. Knight), T. (search)
The instrument has a pair of bifurcated claws which close into each other upon the artery by the force of a spring. The tenaculum-forceps with a sliding ring was used in old Rome. One was disinterred at Pompeii in 1819 by Dr. Cavenko of St. Petersburg, in the Via Consularis. It is pictured in Smith's Dictionary of Antiquities, page 274, and is in the Museum of Portici. e (Fig. 6293) is an instrument invented by Prince, which acts the part of a tenaculum and forceps combined. The upperem of counterpoises, and the reversing apparatus, that it can be manipulated by a child. The cost of this instrument was $1,750. Engineers' and surveyors' portable transit. Troughton's transit-circle. A transit-instrument by Bauer of St. Petersburg has the eye-piece situated in the axis on which the telescope rotates. A reflecting prism in the middle of this axis receives the light from the objective and deflects it at right angles to its original position. The observer is thus enable