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Knight's Mechanical Encyclopedia (ed. Knight) 22 0 Browse Search
The Daily Dispatch: November 15, 1860., [Electronic resource] 2 0 Browse Search
Edward L. Pierce, Memoir and letters of Charles Sumner: volume 3 1 1 Browse Search
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Browsing named entities in Knight's Mechanical Encyclopedia (ed. Knight). You can also browse the collection for Hornblower or search for Hornblower in all documents.

Your search returned 11 results in 6 document sections:

Knight's Mechanical Encyclopedia (ed. Knight), C. (search)
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 pressurt 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 Woolf revived and modified Hornblower's engine, and, by working it with high-pressure steam, obtained results far beyond those of the original inventor. Woolf's first engine was erected at Meux's brewery in 1806. He took up his residence in Cornwall about 1813, where he astonishe<
Knight's Mechanical Encyclopedia (ed. Knight), D. (search)
of varying capacities; there are many modifications in the arrangements and modes of application of the steam. The first engine of this character was that of 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, 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 stereceiving 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 any great extent. Wolf, in his English patent of 1804, improve
Knight's Mechanical Encyclopedia (ed. Knight), H. (search)
and some other features of the 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 M
Knight's Mechanical Encyclopedia (ed. Knight), L. (search)
elf-moving, traveling steamengine. Watt's patents of 1769 and 1784 included the uses of steam-engines for running carriages on land, but he never made any such. A locomotive was made by Cugnot, a Frenchman, in 1769. It is still preserved in the museum of the Conservatoire des Arts et Metiers at Paris, and is described as having a copper boiler, much like a common kettle, and a pair of 13-inch single-acting cylinders, which operated a single driving-wheel roughened on its periphery. Hornblower's steamcarriage had the same date, 1769. Symington showed a model of a steam-carriage in Edinburgh in 1770. It was a long-coupled, fourwheeled carriage, the boiler and engine behind, a coach-body on the usual springs, and in front the guard, who governed the fore-wheels by a lever. To the piston-rod was attached a rack gearing into a pinion on the driving-wheel axle. The writer cannot state whether the said pinion was a ratchet, and allowed the rack to slip back on its return stroke
Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
r piston forces the water and air into the pipe leading to the reservoir on the left, a foot-valve preventing it from running back toward the condenser. The boiler is fed 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 ideawere all worked by horses at the first. See Railway, page 1861. The steam-car was at first made for common roads, as the steamboat was first made for canals. The early steam-carriages were those of Cugnot (French）1769Evans (American)1787 Hornblower (English）1769Medhurst (English）1800 Symington (Scotch)1770Bompas (English）1828 Murdoch (English）1784See steam-carriage. The locomotive, considering the term as referring to a steamcar on rails, originated in Wales. The list of early i
Knight's Mechanical Encyclopedia (ed. Knight), W. (search)
id to escape into the dome-shaped chamber k, whence it is drawn off by the pipe m. See also palier glissant, Fig. 3496; hydraulic pivot. Described in Bramah's English patent, 1802. Wa′ter-bel′lows. A form of blowing-machine invented by Hornblower. It consists of two or more inverted vessels b c suspended from the ends of a working-beam a, and alternately rising and falling in the cisterns d e, which are nearly full of water. Induction and eduction pipes pass from below upward into vessels. l are the eductionpipes leading to a common trunk, by which the air is discharged. The induction-pipes g i have valves on top, and the eductionpipes l have valves at the bottom, so that the air cannot pass in the wrong direction. Hornblower's blowing-machine. The action is as follows:— As the vessel c rises, air passes by the induction-pipe i to the space in the said vessel, the vessel b at the same time descending and driving the air contained therein by means of the educt<