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Knight's Mechanical Encyclopedia (ed. Knight), B. (search)
— and the upper and under wires of the respective pair run in the grooved peripheries of the car-wheels, which are rotated by a steam-engine on board. The car is cigar-shaped, and has sails to be used with favoring winds. The device for passing the posts is ingenious, but does not differ substantially from the mode of hanging the tracks of casterwheels for sliding barn-doors. Signals have been made, and notices, etc., have been distributed, by means of balloons. One was invented by Mr. Shepherd, and used in the Arctic regions in the search for Sir John Franklin. The arrangement consisted of a number of printed packets of oiled silk or paper, upon which directions were printed, stating the latitude and longitude of the exploring ships, where they were going to, and the points at which provisions had been left. These were attached at proper intervals to a long slowmatch made of rope dipped in niter; and as the balloon traveled over the country, the match burned gradually away, r
Knight's Mechanical Encyclopedia (ed. Knight), E. (search)
ed. See telegraph cable. E-lec′tric clock. A dial with hands and goingtrain impelled by recurrent impulses from an electromagnet. The first known clock of this kind was invented by Wheatstone and exhibited by him in 1840. Appold, Bain, Shepherd, and others have contrived clocks on the same principle. See electro-magnetic clock. E-lec′tric es-cape′ment. A device actuated by electric impulse which intermittingly arrests the motion of the scape-wheel and restrains the train to a pnent magnets, which alternately attract and repel the coil of the bob, according to its magnetized or demagnetized condition. A clock of this kind has been kept in motion by electric currents derived from a zinc plate buried in damp earth. Shepherd's electro-magnetic clock was shown at the London Exposition, 1851. In this clock electromagnetism is the sole motor in moving the pendulum, driving the train, and running the strikingworks, no weights or auxiliary springs being employed. The<
Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
of balloons in this species of service was with the Army of the Potomac in the Peninsular campaign, and perhaps in other fields of action. The search for the lamented Sir John Franklin gave rise to many ingenious schemes for signaling the party and giving them notice of succor. Mr. Wallace's plan was to make a survey with the assistance of a captive balloon, affording a means of distributing notices which might reach the party. The plan understood to have been adopted was that of Mr. Shepherd. Balloons were inflated and set free, having printed packets of paper or oil-silk, which were distributed occasionally as the balloon traversed across the country. The papers contained directions, stating the latitude and longitude of the exploring ships, the direction in which they were proceeding, and the localities at which provisions had been left. These papers were attached at intervals to a long slow-match made of rope, dipped in niter, and the match, burning gradually away, rele