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Knight's Mechanical Encyclopedia (ed. Knight) 5 1 Browse Search
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Knight's Mechanical Encyclopedia (ed. Knight), E. (search)
er has been obtained. Page's reciprocating engine (Fig. 1850) consisted of two electro-magnets, the armatures of which are connected by a bar moving upon centers, the bar is connected with the beam, which, by means of a crank, moves the fly-wheel; by means of a breakpiece upon the axle of the fly-wheel, the current is alternately passed through the two magnets. A double-beam engine of similar construction, operated by two pairs of electro-magnets, has also been made. About 1849, Professor Page propelled a car on the track of the Baltimore and Washington Railroad from Washington to Bladensburg, a distance of six miles, and back, by means of an engine of his invention, attaining a speed of nineteen miles an hour. Various forms of electro-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 machi
Knight's Mechanical Encyclopedia (ed. Knight), I. (search)
Electricity.) That effect of an insulated electrified body which tends to produce an opposite electrical state in surrounding bodies. In-duc′tion-coil. A compound coil by which voltaic or dynamic electricity is converted into static electricity or electricity of high tension. The discoveries of Faraday, Henry, Bequerel, and others led the way to the invention of the induction-coil, and it is believed that the first practically useful device of the kind was contrived by the late Dr. Charles G. Page of Washington. Induction-apparatus. Ruhmkorff, of Paris, having made many instruments of the kind and contrived various improvements, the instrument is now very generally called by his name. It consists essentially of an inner coil of coarse wire surrounding a core of soft iron rods, and connected with the poles of a voltaic battery. It is itself surrounded by, though insulated from, a coil of copper wire composed of a great number of convolutions, and connected with the d
Knight's Mechanical Encyclopedia (ed. Knight), T. (search)
nd under the influence of certain variations in the state of the atmosphere, the effect being due to the transmission of atmospheric electricity. This transmission does not in fact occur in a continuous manner like that of a current, but rather by a series of discharges. Mr. Beatson has proved that the discharge of a Leyden jar through an iron wire causes this wire to produce a sound if the discharge is first passed through a moist conductor, such as a wet string or animal tissue. Professor Page in America, De la Rive in France, Gassiot in London, and Marrian in Birmingham, discovered that rods of iron placed in the interior of a helix through which a current of electricity is passed give out decided sounds at the moment when the circuit is made or broken. Reis applied this discovery in his telephone. By causing the circuit to be made and broken very rapidly, a musical note was emitted by a rod placed in a helix traversed by the current. De la Rive found that exactly simi