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Document Max. Freq Min. Freq
Harper's Encyclopedia of United States History (ed. Benson Lossing) 49 49 Browse Search
Lucius R. Paige, History of Cambridge, Massachusetts, 1630-1877, with a genealogical register 48 48 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. 17 17 Browse Search
Knight's Mechanical Encyclopedia (ed. Knight) 13 13 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) 8 8 Browse Search
George Bancroft, History of the United States from the Discovery of the American Continent, Vol. 3, 15th edition. 4 4 Browse Search
Edward H. Savage, author of Police Recollections; Or Boston by Daylight and Gas-Light ., Boston events: a brief mention and the date of more than 5,000 events that transpired in Boston from 1630 to 1880, covering a period of 250 years, together with other occurrences of interest, arranged in alphabetical order 3 3 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.) 3 3 Browse Search
Historic leaves, volume 4, April, 1905 - January, 1906 3 3 Browse Search
Southern Historical Society Papers, Volume 19. (ed. Reverend J. William Jones) 2 2 Browse Search
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Browsing named entities in Knight's Mechanical Encyclopedia (ed. Knight). You can also browse the collection for 1741 AD or search for 1741 AD in all documents.

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of the suspensionbridge in which catenary chains supported the floor. The first was erected over the Tees, in England, in 1741. Rods with eyes and connecting-links were used by Telford on the Menai Suspension Bridge, 1829; steel wires laid up (not The first application of change-wheels to a lathe is supposed to have been in a fusee-cutting lathe, described in a work, 1741. The change-wheels are intermediate, and journaled in a bracket, which permits them to be brought into engagement with thoses of astronomy as early as 1484. Gemma Trosius, in 1530, suggested their use at sea for acertaining the longitude. In 1741, the English government offered a reward of £ 20,000 for a correct mode of determining longitude at sea. This was won by Hprime conductor collects and transmits the frictional electricity of the electrical machine. It was introduced by Bose in 1741. A lightning-conductor, for conducting the static or tension electricity of the atmosphere harmlessly to the earth. It
y means of a swing-frame. The circumference of the 45-inch circle was originally divided into five parts, each of these into three; these were then bisected four times, dividing the wheel into 240 parts, each of which was designed to contain nine teeth. Ramsden's screw-cutting apparatus. The first application of the tangent-screw and ratchet to the purpose of graduation is stated by Holtzapffel to have been by Pierre Fardoil. See plate 23 of Thiout's Traite d'horlogerie, etc., Paris, 1741. Fig. 1677 illustrates Ramsden's application of the principle of the engine just described in originating the screw of his dividingengine for straight lines. The guide-screw G is turned by the winch, and in each revolution moves the larger tangentwheel one tooth, winding on to the boss p a slip of watch-spring which carried the slide on which the tool t was fixed, thus cutting the screw C, which was at the same time rotated by the gearing c g from the prime shaft. The object was to cut a
machine (Fig. 2133) for cutting the snail-shaped or spirally grooved wheel on which the chains of certain descriptions of watches are wound. It was invented by the renowned Dr. Hooke about 1655. The machine (f) shown is the form that was used in 1741, and illustrates the idea thoroughly. It is also interesting as being the first machine in which change-wheels were used, and is the germ of the screw-cutting lathe. — Thirion, 4to, Paris, 1741. Fu-see′--wind′lass. A pump-windlass with a co1741. Fu-see′--wind′lass. A pump-windlass with a conical barrel (g, Fig. 2133). Fuse-ex-tract′or. This implement is designed for extracting wooden fuses from shells. It has jaws which grasp the fuse while the lower part of the extractor rests upon the shell. The jaws are attached to a screw, which works in a screw-socket in the body of the extractor, and has an iron lever passing through its head. The jaws being clasped around the projecting part of the fuse, it is drawn by turning the lever. Fuse-lock. Fuse-lock. For mi
which was played by a performer at each end. Burney refers to a transposing harpsichord of 1760: By drawing out the keys the hammers are transferred to different strings, by which means a composition is transposed half a note, a whole note, or a flat third lower at pleasure. In 1730 Harris took an English patent for his harpsichord, with two sets of strings, on which may be played either one unison or two; or two unisons and an octave together, and the Fortes and the Pianos, etc. Plenius, in 1741, also refers to the forte and piano capacity of his instrument. In 1774, the patent of Merlin described a new-invented kind of compound harpsichord, in which, besides the jacks with quills, a set of hammers of the nature of those used in the kind of harpsichords called piano-forte, are introduced, etc. Piano-Forte movements. A, Bartolomineo Cristofori of Florence, 1711. B, Mason, London, 1755. C, single action. The hammer-harpsichord, so called from the substitution of hammers
d threads by crossing or uncrossing the belts. It was farther improved by Hindley, a watchmaker of York, England, about 1741. It was a watchmaker's and bench instrument for many years before it had any place in the machine-shop. Fig. 4721 illu bath of silver solution in the usual way, the glass being perfectly clean. See next article. See also Platinizing, page 1741; looking-glass, pages 1350, 1351; Mir-Ror, pages 1452, 1453; glass-silvering, pages 982, 983. Sil′ver-ing glass. I invented about 1655, had mechanical devices for guiding the tools. These, as well as the screw-cutting lathe of Hindley, 1741, and other machines having similar contrivances, were particularly constructed for the use of clockmakers, who were the fid in same city, 1705). The first chain-bridge in England appears to have been laid across the river Tees about the year 1741; its length was 70 feet, and breadth rather more than two; it was a mere foot-bridge, and seems to have been a very rude a
whence it was conducted to the chimneys. This plan was not permitted to have a fair trial, and was succeeded by the centrifugal fan, invented by Desaguliers in 1734. One of these was erected over the ceiling of the House, and continued to do duty until 1817, being subsequently superseded by the arrangement contrived by the Marquis de Chabannes. See A course of experimental philosophy, by J. F. Desaguliers, Ll.D., F. R. S., Chaplain to his Grace the Duke of Chandos. London, 1734. About 1741, or shortly after the invention of the fan-blower by Desaguliers, the Rev. Dr. Hales contrived a ventilator which he endeavored to introduce into the British navy. It worked on the bellows principle, and was composed of two oblong boxes, each of which had a valve moved up and down by rods attached to a lever working on a central pin. Air was drawn into the machine through inwardly opening valves, and expelled by valves opening outwardly. It required the labor of two men, and the inventor c