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Knight's Mechanical Encyclopedia (ed. Knight), A. (search)
f operation is found in those annunciators whose openings are all covered by pivoted shields, the numbers being permanently attached in the rear. The motion of the wire trips the sounding-hammer as before, and at the same time trips the shield to which it belongs, and causes it to oscillate from before the opening and expose the number to which it belongs. A crank operated by the hotel clerk restores the normal condition after the number has been observed. Horsfall, October 4, 1853, and Hale, April 22, 1856, are among the earlier inventors. In Horsfall's, the wire from the room operates a rod whose horizontal lifting and tripping arm extends beneath its appropriate swinging index-plate. The rod and arm are arranged in such relation to the rocking-frame which carries the alarm-bell, that, as either of the rods is raised for the purpose of tripping one of the index-plates and exposing its number to view, the frame and bell will be also raised, and the pendulous hammer allowed t
Knight's Mechanical Encyclopedia (ed. Knight), M. (search)
lower position, and vice, versa. Man′heim-gold. A brass used by jewelers, as an imitation of gold. Copper, 3; zinc, 1; tin, a small quantity. See also Semilor ; alloys, jewelers', p. 63. Man-hole. A hole in a cesspool, drain, iron boiler, tank, or a chamber or compartment on an iron ship, designed to allow the entrance of a man for examination, cleansing, and repairs. In boilers and tanks it is usually secured by a bridge and bolt, so as to render it water, steam, or Man-Hale. air tight, as the case may be. In drains, the cover is a lid with a stink-trap joint. Man-hole door. The cover or lid of a man-hole in a boiler or tank. A man-hole plate. Man′i-chord. （Music.) An instrument resembling the spinet and harpsichord (which see). It was originally a monochord (single string), and is referred to by Giraud de Calanson, a poet of Provence (manicorda, ab una corda). It was played by quills, operated by jacks and keys on a key-board. It was one <
Knight's Mechanical Encyclopedia (ed. Knight), P. (search)
ese. 12. Gypsum in water for plasterers. Pasteboard. A thick paper board, made by pasting together a number of sheets of paper. This is afterward pressed to remove the water of the paste, dried and calendered. See also cardboard. In Hale's machine for lining straw-board or thick paper with a thinner material, the thin lining-paper is wound on a roll D, and is caused to pass over a pasting-roller E in the trough C, provided with an adjustable knife or scraper H. The thick board is fed up from below and united to the lining by a pair of rolls, between which the two conjointly pass. Hale's pasteboard-machine. Pasteboard-cut′ter. The machine (Fig. 3565) is for grooving and cutting pasteboard strips employed for making boxes. The board passes successively between the rollers D F, C E. The rollers F are provided with grooving disks q, which are opposed to the surface of the plain roller D, and may be adjusted to crease the board at any desired distance from the ed
Knight's Mechanical Encyclopedia (ed. Knight), R. (search)
se rockets were first employed in the attack on Boulogne, in 1806, and again at Copenhagen, in 1807. They were also used at the battle of Leipsic, 1813, by the British rocket troop, an organization which is still maintained in that service. In Hale's rocket, the stick is dispensed with. As originally made, this rocket, which in external appearance resembles Congreve's, had a central aperture at the rear, through which the propelling gas escaped, surrounded by smaller tangential apertures fohose to which sticks were attached. It sometimes, however, happened that immediately after starting one would diverge from a straight course and perhaps turn completely over, returning toward the place whence it was fired. To obviate this, Mr. Hale placed the tangential directing apertures near the head, instead of at the base of the rocket. The composition with which they are filled consists of niter, 10 parts; sulphur, 2; charcoal, 3. This is inserted in charges of about 3 1/2 ounces
Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
ondenser, to be used in the event of injury to the latter. Sea-gage. （Nautical.) a. An instrument invented by Drs. Hale and Desaguliers, to ascertain depths beyond ordinary deep-sea soundings. It is a self-registering apparatus, in which the. 5, 1864. 42,292JohnsonApr. 12, 1864. (Reissue.)1,962TurnerMay 16, 1865. 48,511Bradford et al.July 4, 1865. 50,117HaleSept. 26, 1865. 50,642TewkesburyOct. 24, 1865. 50,917Dawley et al.Nov. 14, 1865. 50,995Keats et al.Nov. 14, 1865. 51,153. 136,543PuseyMar. 4, 1873. 138,435RangeMar. 29, 1873. 140,324VetterJune 24, 1873. 147,572RangeFeb. 17, 1874. 149,115HaleMar. 31, 1874. 149,546TraceyApr. 7, 1874. 149,767LoomisApr. 14, 1874. 154,167Anderson et al.Aug. 18, 1874. 3. Covers. iff bar with rings at the end as cheek-bars to keep the rings out of the horse's mouth. It is usually of round iron. Hale's driving-bit, September 10, 1867, is of round iron, and is covered with a rubber tube. Dawson's bit, September 24, 186
Knight's Mechanical Encyclopedia (ed. Knight), U. (search)
atter by means of registers, and so arranged that the exit-openings are toward the rear of the train, the suction of the atmosphere having the effect of drawing the air out of the car through the elbow-pipes. See also Figs. 95 to 99, page 46. The ventilator for ships is commonly a wind-sail; a large tube of canvas having an expanded mouth, which is turned in the direction of the wind while the tube is directed down the hatchway, conveying the air to the lower deck. The contrivances of Hale and Sutton have been mentioned. Dr. Thiers, of New York, has patented (November 29, 1870) an apparatus in which the oscillating motion of mercury contained in a horizontal tube or tubes running athwartships and fore and aft, producing a partial vacuum, is caused to exhaust the foul air. The fluid is kept in motion by the rolling and pitching movements of the vessel. Perkins, about 1820, proposed to ventilate ships by using two barrels half filled with water, placed diagonally to the line