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Document Max. Freq Min. Freq
Harper's Encyclopedia of United States History (ed. Benson Lossing) 147 147 Browse Search
Lucius R. Paige, History of Cambridge, Massachusetts, 1630-1877, with a genealogical register 47 47 Browse Search
Benjamin Cutter, William R. Cutter, History of the town of Arlington, Massachusetts, ormerly the second precinct in Cambridge, or District of Menotomy, afterward the town of West Cambridge. 1635-1879 with a genealogical register of the inhabitants of the precinct. 16 16 Browse Search
Knight's Mechanical Encyclopedia (ed. Knight) 15 15 Browse Search
Cambridge History of American Literature: volume 3 (ed. Trent, William Peterfield, 1862-1939., Erskine, John, 1879-1951., Sherman, Stuart Pratt, 1881-1926., Van Doren, Carl, 1885-1950.) 10 10 Browse Search
C. Edwards Lester, Life and public services of Charles Sumner: Born Jan. 6, 1811. Died March 11, 1874. 8 8 Browse Search
HISTORY OF THE TOWN OF MEDFORD, Middlesex County, Massachusetts, FROM ITS FIRST SETTLEMENT, IN 1630, TO THE PRESENT TIME, 1855. (ed. Charles Brooks) 6 6 Browse Search
Francis Jackson Garrison, William Lloyd Garrison, 1805-1879; the story of his life told by his children: volume 2 6 6 Browse Search
The Daily Dispatch: March 13, 1862., [Electronic resource] 5 5 Browse Search
Cambridge History of American Literature: volume 1, Colonial and Revolutionary Literature: Early National Literature: Part I (ed. Trent, William Peterfield, 1862-1939., Erskine, John, 1879-1951., Sherman, Stuart Pratt, 1881-1926., Van Doren, Carl, 1885-1950.) 5 5 Browse Search
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Browsing named entities in Knight's Mechanical Encyclopedia (ed. Knight). You can also browse the collection for 1791 AD or search for 1791 AD in all documents.

Your search returned 15 results in 8 document sections:

Knight's Mechanical Encyclopedia (ed. Knight), C. (search)
al source of production. It was first brought to Europe in the early part of the eighteenth century, and fifty years later was mentioned by Dr. Priestly as a substance excellently adapted for removing pencil-marks from paper. Crumb of bread had previously been employed for this purpose. The sap, obtained by tapping the trees, is dried over a fire, which gives it the dark appearance observable in the rubber of commerce. For many years its various adaptabilities seemed unperceived, but in 1791 Samuel Peal obtained a patent for water-proofing fabrics by means of this gum dissolved in spirits of turpentine; though this does not seem to have led to any practical results. Besides turpentine, ether, bisulphide of carbon, naphtha, some of the volatile oils, and especially benzole, are its best solvents. Acids and alkalies exert but little influence upon it. Hancock, 1823, and Mackintosh, were the first who really applied this gum to its present uses. Their original processes consis
Knight's Mechanical Encyclopedia (ed. Knight), G. (search)
ns applied if in a cylinder so that the atmospheric pressure might force a piston downward when the vacuum was thus formed beneath it. Papin substituted a bell-valve over the air-eduction port, for the collapsible leathern tubes of Huyghens. In 1791 Barber took an English patent for a gasengine in which a stream of carbureted hydrogen gas was introduced at one induction port and a quantity of atmospheric air at another, the resulting combustion giving an explosive force against the piston. Sor his explosive chamber, the vacuum being utilized by the resulting atmospheric pressure upon the piston moving in the cylinder. Papin substituted a bell-valve over a hole in the middle of the piston for the leather tubes used by Huyghens. In 1791, Barker patented a gas-engine having the main features of the modern gas-engine; streams of carbureted hydrogen gas and atmospheric air being introduced through different conductors into a cylinder, in which the gas was exploded, the effect being
Knight's Mechanical Encyclopedia (ed. Knight), H. (search)
2 by 3 1/2 feet and 1 inch apart. This box had an air-escape cock, a steam-induction pipe, and a water-escape. It was supplied by the boiler of the establishment. The experiment was repeated by a system of copper pipes, under Hoyle's patent, 1791. The steam ascended to the top of the building and passed downward. Lee of Manchester erected a heating apparatus of cast-iron pipes, which also served as supports for the floor. This was constructed by Boulton and Watt in 1799. Fig. 2473 ge used in England. Blackett improved on Trevethick, and used smooth wheels on a plate-way. The multitubular boiler is stated to have been used by Rumsey, and subsequently, in 1790, in England. It was used by John Cox Stevens of New Jersey, 1791 – 1807; English patent, May 31, 1805. He used a Watt engine, cylinder 4 1/2 inches diameter, 9 inches stroke. Boiler 2 feet long, 15 inches wide, and 12 inches high, with 81 copper tubes 1 inch in diameter. Boat, 25 feet long, 5 feet beam; trie
Knight's Mechanical Encyclopedia (ed. Knight), L. (search)
Germany1561. Pillow-lace making taught at Gt. Marlow, England1626. Strutt's machine for making open work stockings1758. Crane's Vandyke machine1758. Else and Harvey's pin machine1770. Frost's point-net machine1777. Dawson's point-net machine1791. Heathcoat's bobbin-net machine1801. Hill's plain ground net machine1816. Limerick lace made1829. Laced-stocking. A bandage support for varicose veins, weak legs, etc. Lace-mak′ing ma-chine′. Lace is a delicate kind of network comned. See duplex-lathe. The slide-rest is the invention of General Sir Samuel Bentham, and is the precursor and original of the planing-machine for metal. General Bentham is the inventor of the planing-machine for wood, patented in England in 1791. It seems to have been a reciprocating machine, acting after the manner of a hand-planer. He afterward invented the planingmachine with circular cutters. See planing-machine. Since the beginning of the century, numerous improvements in the
Knight's Mechanical Encyclopedia (ed. Knight), P. (search)
relational positions and explaining celestial phenomena. Dr. Desaguliers described a complete planetarium in his Course of experimental philosophy, published in 1734. A very complete apparatus of the kind was a planetarium shown in London in 1791, and purchased by the English government in 1793, to be sent out with Lord Macartney on his embassy to China, as a present to the emperor of the Celestial Flowery Land. It was said to have been ample and scrupulously correct. Whether the Englisholding-machine (which see). Planing-machines for wood-working are of three general kinds, and will be mentioned in the order of their invention, not of their usefulness. a. The reciprocating planing-machine was invented by General Bentham in 1791, its action being based upon that of an ordinary plane. It had a large plane or stock with inclined bits (plane-irons) which reciprocated on ways, planing down to a thickness the board which lay upon the bed beneath, the board being moved forward
Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
ddles adjustable to fit different horses, a Mr. Smith, in 1786, made the fore points of steel springs with gulletplates set out or narrowed by setscrews. Dunn, in 1791, made jointed gullet-plates. b. The frame of a harness-saddle or gig-saddle. In the example, the check-rein hook G is secured between the seat and the tree by m 1800. The slide-rest is the origin of the planing-machine for metal. Bentham was also the inventor of the first planing-machine for wood, patented in England in 1791, but invented by him in Russia some years previous. The sliderest is described in his patent of 1793. Nasmyth ascribes the invention of the automatic slide-res, supplied with steam from the boiler of the establishment. It had an air-escape cock, steam induction, and condensed-water escape-pipe. Hoyle (English patent, 1791) had a system of steam-pipes. The steam ascended to the top of the building, and condensed as it descended. In 1793 a method was patented for heating rooms by
Knight's Mechanical Encyclopedia (ed. Knight), T. (search)
de of tissue, rendered more transparent by treatment with oil or varnish. Ti-ta′ni-um. Equivalent, 25; symbol, Ti.; fusible under the blow-pipe. Has a deep blue color, and is used in coloring porcelains and enamels. Discovered by Gregor in 1791. Its ore is called menachanite, from Menachan, in Cornwall, where it was first found. Ti′tho-nom′e-ter. An instrument for noting the tithonic or chemical effect of the rays of light. See actinometer. Ti-thon′o-type. （Photogrape set up to form words, lines, and pages. The movable type of China, A. D. 1041, is described in Ringwalt's Encyclopaedia of printing, page 104, and in this work supra, page 1790. The movable type of Europe is referred to, supra, pages 1790, 1791. First made by Guttenberg or Koster (Laurentius Zanssen); first cast by Schoeffer. Type. The first book executed with cast-metal type is said to have been the Durandi rationale Divinorum Officiorum, published in 1459. See printing.
Knight's Mechanical Encyclopedia (ed. Knight), W. (search)
nd 2 1/2 yards long. Two workmen can make twenty sheets in a day. No sizing is used, as the gelatine of the root is sufficient for that purpose. A better sort of paper is sold in sheets 12 to 18 inches long, and 4 to 5 inches wide. Writing is done with charcoal, or with pencils prepared of coal and lime. Wood-plan′ing ma-chine′. Bramah's English patent, 1802. The planing-machine for wood long preceded that for metal. General Bentham's reciprocating planingmachine was invented in 1791; Bramah's transverse planer, in 1802. See planing-machine, pages 1728, 1729. Wood-polishing machine. Wood-pol′ish-ing ma-chine′. Fig. 7335 shows a machine for polishing pencils, which are placed on an endless apron, that runs over a table. The ends of the pencils enter guide-notches in the blocks of an inner endless apron, running at a different speed from the former apron, so as to cause rotation in the pencils as they are carried forward beneath the polishing-blocks, which are r