hide Matching Documents

The documents where this entity occurs most often are shown below. Click on a document to open it.

Document Max. Freq Min. Freq
Harper's Encyclopedia of United States History (ed. Benson Lossing) 182 182 Browse Search
George Bancroft, History of the United States from the Discovery of the American Continent, Vol. 10 107 107 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. 46 46 Browse Search
Lucius R. Paige, History of Cambridge, Massachusetts, 1630-1877, with a genealogical register 40 40 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) 19 19 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.) 9 9 Browse Search
Knight's Mechanical Encyclopedia (ed. Knight) 9 9 Browse Search
Medford Historical Society Papers, Volume 8. 7 7 Browse Search
Southern Historical Society Papers, Volume 36. (ed. Reverend J. William Jones) 5 5 Browse Search
Edward L. Pierce, Memoir and letters of Charles Sumner: volume 2 5 5 Browse Search
View all matching documents...

Browsing named entities in Knight's Mechanical Encyclopedia (ed. Knight). You can also browse the collection for 1781 AD or search for 1781 AD in all documents.

Your search returned 9 results in 7 document sections:

Knight's Mechanical Encyclopedia (ed. Knight), B. (search)
hu or boat trading between Singapore and the islands of the Indian Archipelago. The bujrah is a flat-bottomed Ganges boat with cabins. Bug′gy. （Vehicle.) A light four-wheeled vehicle, having a single seat. The top, when it has one, is of the calash kind. In this case it is commonly known as a top-buggy. Bug′gy-boat. One having a provision for the attachment of wheels, so as to be converted into a land vehicle. It was invented and used by Sir Samuel Ben- tham, in Russia, 1781, and was patented by him. He afterwards extended the idea to baggage-wagons. A flexible boat of connected sections was also used by him to convey the Empress Catharine down the Dneiper, and was called by him the Vermicular. The idea has been lately revived on the Thames, the boat being called the Connector. Bentham's boat had six sections, drew six inches of water when loaded, and was rowed by 124 oarsmen. No space of more than an inch was to be found between the sections during flexion o<
Knight's Mechanical Encyclopedia (ed. Knight), C. (search)
n engine-lathe, moved longitudinally (along the work) by the leading-screw, actuated by the feed; and transversely (to or from the work), by its own feed-screw. Compound screw. Two or more screws on the same axis. When the pitch of the respective screws varies, it forms a differential screw (a); when they run in different directions, it is a right and left screw (b). Compound screws. Com′pound Steamen′gine. （Steam.) A form of steam-engine originally patented by Hornblower in 1781, in which steam at a relatively greater pressure was allowed to expand in a small cylinder, and then, escaping into a larger cylinder, to expand itself against a larger piston. As steam was applied in his day at so very small a pressure, the particular value of the idea was not developed until Trevethick and Woolf used a high pressure in the first cylinder with expansion into a larger one. Trevethick applied high-pressure steam to Watt's ordinary single cylinder or Cornish engine, while W<
Knight's Mechanical Encyclopedia (ed. Knight), D. (search)
Hornblower, in which two piston-rods were connected to the same arm of the walking-beam, but at different distances from its center of oscillation. As usually understood, the double-cylinder engine involves the use of the same steam in two cylinders consecutively; first at a relatively high pressure in a smaller cylinder, and then at a lower pressure in a larger cylinder. Working steam expansively was invented by Watt and introduced in 1778. Hornblower's expansive engine, patented in 1781, had two cylinders, of different sizes, their respective piston-rods being connected to the working-beam. An amount of steam of the capacity of the smaller cylinder was expended at each stroke, the upper part of the said cylinder receiving live steam from the boiler, and the lower part communicating with the space above the piston of the larger cylinder, where it was used expansively. Hornblower's engine occupies one notable point in the history of the steam-engine, but was not adopted to
Knight's Mechanical Encyclopedia (ed. Knight), H. (search)
engine now known as the Cornish (which see). Watt subsequently used actual pressure of steam, was the first to use it expansively by cutting off at a part of the stroke, and also invented double-action engines in which the steam was admitted to alternate sides of the piston, making both motions effective. He made drawings for this in 1774, and exhibited it in 1782. He called it a double-engine, which must not be confounded with the doublecylinder engine of Hornblower of Penryhn, patented in 1781, revived by Woolf, and much improved by Worthington. See plate opposite page 763. Oliver Evans of Philadelphia has hardly had sufficient credit for his part in the matter, but he struggled for many years to make his townsmen believe that the high-pressure, double-acting engine was to be the engine of the future, both on roads and boats. He was active in the running of his hobby from 1787 to 1803, and in the former year obtained a patent from the State of Maryland for steam-carriages on c
Knight's Mechanical Encyclopedia (ed. Knight), N. (search)
plied rapidly in the Colonies. The common name Gazette is derived from the name of a Venetian coin, worth about a cent and a half, and which was the price of the Venetian newspaper first published. The Maryland gazette was established in 1727 or 1728; the Virginia gazette, 1736; the Rhode Island gazette, 1732; South Carolina gazette, 1731 or 1732; Georgia gazette, 1763. The first paper in New Hampshire was published in 1756, but in the adjacent State of Vermont none existed prior to 1781. After the Revolution, the history of newspaper progress becomes identical with that of the nation, the printing-press keeping closely in the van of Anglo-American civilization. The honor of publishing the first paper west of the Alleghanies is claimed for John Scull of Pittsburgh, who, it is stated, founded the Pittsburgh gazette in 1783. The first north of the Ohio River, being the third or fourth west of the Alleghanies, is said to have been the Centinel of the Northwest territory
Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
ible colors. (See prism.) He also found that these colors, which combined to form white light, could not be farther separated by undergoing a second refraction In 1781, Scheele, who discovered the fact that light exercises a chemical action upon chloride of silver, found that the compound was blackened most toward the violet enuck's-foot propeller. In 1775 we are informed that M. Perier navigated a small steamboat on the Seine. Marquis de Jouffroy's mode of propelling boats. In 1781 the Marquis Jouffroy constructed and ran a steamboat on the Saone Fig. 5606 shows the peculiar features of the engine and the mode of propulsion of the boat. The d from the reservoir, and superfluous water and air escape therefrom. Hornblower's steam-engine was an expansive engine, having two cylinders. His patents were 1781, 98, 1805. The steam was worked expansively in a second and larger cylinder, after a previous use in a primary cylinder. Woolf very much improved this idea abo
Knight's Mechanical Encyclopedia (ed. Knight), U. (search)
eman belonging to the custom-house who, for fear of rain, borrowed the umbrella at Will's coffee house, Cornhill, of the mistress, that to be dry from head to foot, on the like occasion, he shall be welcome to the maid's pattens. Gay mentions the umbrella as early as 1712, in his poem of Travia, in which he says :— The tucked — up seamstress walks with hasty strides, While streams run down her oiled umbrella's sides. Mr J. Jamieson, a Scottish surgeon, brought with him from Paris, in 1781, an umbrella, which was the first seen in Glasgow, where he resided, and where it attracted universal attention. About 1774, umbrilloes were mentioned as being used in Boston. They were large, blue, with a ferrule like a small pagoda, and wood enough in the handle for a harpoon-stock. In the manufacture of umbrellas and parasols, the system of the division of labor is carried to a high degree of perfection, enabling the commoner qualities to be produced exceedingly cheap. In prepari