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Knight's Mechanical Encyclopedia (ed. Knight), D. (search)
push loosen the pole and set the horses at liberty. William's English patent, 1802, operates by a cord releasing a bolt, which allows the studs to which the traces are attached to rotate and the traces to slip off. Since these, numerous devices have been suggested, but have not come extensively into use. De-tect′or. 1. An arrangement in a lock, introduced by Ruxton, by which an over-lifted tumbler is caught by detent, so as to indicate that the lock has been tampered with. In Mitchell and Lawton's lock, English, 1815, the motion of the key throws out a number of wards, which engage the key and keep it from being withdrawn until the bolt is moved, when the pieces resume their normal position and release the key. Should the key fail to act upon the bolt, it cannot be withdrawn, but the lock must be destroyed to release it. Chubb had a detector in his lock of 1818. 2. A means of indicating that the water in a boiler has sunk below the point of safety. See lowwater de
Knight's Mechanical Encyclopedia (ed. Knight), K. (search)
relative positions, as in planing squares, hexagons, etc. See Fig. 2748. Key-Fastener. The slotting-machine is an outgrowth of the keygrooving machine. Key-guard. A shield which shuts down over a lock-key to prevent its being pushed out of the lock from the outside. In the example, a slotted escutcheon on the plate shuts over a flattened portion of the key-shank to prevent its being turned by an outsider. A pawl acts as a detent for the escutcheon. Key′hole-pro-tect′or. Mitchell and Lawton's English patent, 1815, has a revolving curtain for closing the keyhole. Key-guard. Day and Newell's parautoptic lock has a revolving ring or curtain, which moves with the key and shuts the hole, so that wires and tools cannot be introduced alongside the key. Mordan's keyhole protector (English), 1830, has a short pipe which, after the door has been locked, is thrust into the keyhole; attached to the pipe is a small lock so contrived that, on turning its key, two lancet
Knight's Mechanical Encyclopedia (ed. Knight), L. (search)
ted by a stud g working in the slot on the bolt shown at J. The sliders are provided with false notches to increase the difficulty which a burglar would experience in finding the position of the true ones. The key f has longitudinal slots corresponding in length to the distance which each slider must be depressed. I is an exterior view of the lock, and J shows the form of the bolt and the manner in which the rotation of the barrel is made effective in throwing the bolt. The patent of Mitchell and Lawton, 1815, embraced, among other devices, a revolving curtain for closing the keyhole. A detector which indicated if any of the tumblers had been overlifted was patented by Ruxton in 1816. In the same year, Kemp devised a lock whose sliders were operated by a set of small concentric tubes in the barrel of the key. Paper secured over the keyhole to indicate tampering was patented by Gottleib, 1829. At the present day, the aid of photography has been called into requisition
Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
de of wrought-iron and solid; those of larger size are frequently hollow and made of cast-iron. They were invented by Mitchell, in England, and are principally employed as foundations for lighthouses, for beacons, and for mooring buoys. They weor telegraph posts. d d, piles for tethering animals, or, on a larger scale, for attaching guys or crab moorings. Mitchell's screw-pile. Fig. 4738 is a view of the screw-pile lighthouse on Thimble Shoal, near the entrance to Hampton Roads.Spencer et al.Nov. 23, 1858. 22,255MackenzieDec. 7, 1858. 23,157CooperMar. 8, 1859. 26,130SingerNov. 15, 1859. 26,366MitchellDec. 6, 1859. 26,586HarrisonDec. 27, 1859. 27,208DavisFeb. 21, 1860. 28,610Scofield et al.June 5, 1860. 31,625Richardum et al.May 24, 1859. 25,715Blake et al.Oct. 11, 1859. 26,207SerrellNov. 22, 1859. 27.805HowellApr. 10, 1860. 28,889MitchellJune 26, 1860. 31,602HowellMar. 5, 1861. 31,645MarshMar. 5, 1861. 31,878DownerApr. 2, 1861. 32,035WhitcombApr. 9, 186
Knight's Mechanical Encyclopedia (ed. Knight), T. (search)
es the wire being comparable only to that of light, though Professor O. M. Mitchell determined that a minute though appreciable interval of til of the Cincinnati Observatory was purchased in Munich by Professor O. M. Mitchell, the originator and director of the observatory. The obje under the action of the key. II. This group is illustrated by Mitchell's machine, in which each type, as it is delivered from its recepta38.BeniowskiOctober29, 1850. 9,418.HarmonNovember23, 1852. 9,974.MitchellAugust30, 1853. 10,656.BeaumontMarch21, 1854. 10,929.MitchellMay1MitchellMay16, 1854. 13,710.LongboroughOctober23, 1855. 339.Longborough (reissued)January8, 1856. 15,310.KoenigJuly15, 1856. 16,743.MitchellMarch3, 18MitchellMarch3, 1857. 16.947.HoustonMarch31, 1857. 18,175.AldenSeptember15, 1857. 3,572.Alden (reissued)July27, 1869. 18,264.MitchellSeptember22, 1857. MitchellSeptember22, 1857. No.Name.Date. 26,149.GilmerNovember15, 1859. 28,463.FeltMay29, 1860. 28,857.HargerJune26, 1860. 30,211.Dorsey and MathersOctober2, 1860.