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
Knight's Mechanical Encyclopedia (ed. Knight) 26 2 Browse Search
View all matching documents...

Your search returned 26 results in 7 document sections:

in dyeing with indigo. Dipping-needle. Dip′ping-nee′dle. The inclination or dip of the magnetized needle was not known to the Chinese, who had discovered its variation during the twelfth century. This element of terrestrial magnetism appears to have been discovered by Robert Norman, a compass-maker of Ratcliff, London, who detected the dip and published the fact in 1576. He contrived the dipping-needle, and found the dip at London to be 71° 50′. See also dip-circle. Captain Sir James Ross, the celebrated Arctic navigator, reached the magnetic pole, latitude 70° 5′ 17″ north, and longitude 96° 46′ 45″ west, on the 1st of June, 1831. The amount of dip was 89° 59′. Horizontal needles refused to work, showing no sensitiveness. He erected a cairn of limestone rocks, inclosing a tin case containing the record. The cairn may remain, unless the Esquimaux Indians have removed it in search of plunder, but the magnetic pole has moved away. The dipping-needle i
tches along the coast of China, making a semicircular sweep to the west till it reaches the latitude of 71° north, when it deseends again to the south, and returns north with a great semicircular bend which terminates in the White Sea. Captain Sir James Ross reached the magnetic pole, latitude 70° 5′ 17″ north, and longitude 96° 46′ 45″ west, on the 1st of June, 1831. The amount of dip was 89° 59′. Horizontal needles refused to work, showing no sensitiveness. He erected a cairn of limestonehering to the mold is allowed to dry, and the process repeated until the required thickness is obtained. 3. (Shipbuilding.) Giving the correct outline and depth to ship's timbers, etc. It is one part of the operation of forming (which see). Ross's molding and casting apparatus. Mold′ing-appa-ra′tus. (Founding.) A device or machine for molding. In that represented in Fig. 3195, the operations of molding, facing, drying, coring, casting, and stripping are carried on c
e investigated by Sir John Herschel, Professor Airy, and others, and, acting on their theoretical views, Mr. Joseph Jackson Lister succeeded in effecting one of the greatest improvements in the manufacture of achromatic object-glasses by uniting a plano-convex flint lens with a convex lens by means of Canada balsam. This diminishes by nearly one half the loss of light occasioned by reflection where the surfaces unite, and prevents the dampness or the formation of mold at the junction. Mr. Ross, who subsequently devoted much time to the improvement of objectives, employs three lenses of this kind in order to correct the chromatic and spherical aberrations corresponding to varying distances of the object, when it has to be viewed through an interposed plate of glass. Microscopic objective. This is effected — supposing the posterior and middle combinations a b to have together an excess of negative aberration — by causing the anterior combination c to have an excess of posi
repared by dissolving tin in nitro-muriatic acid, filtering the solution, and precipitating the peroxide thus formed with liquid ammonia; the precipitate is washed with water, collected on a cloth filter, dried and pressed so as to form a lump, which is broken into pieces and, after farther drying, levigated on a glass plate with an iron spatula, and subjected in a crucible to a low white heat. The powder is then washed or elutriated to remove the coarser particles. This process is due to Mr. Ross. Puz′zle. A contrivance for affording amusement and exercising the ingenuity by taking apart a set of connected devices, combining a number of separate pieces so as to produce one or more figures, finding the mode of entry in or egress from a space inclosed by a complicated series of lines, etc., etc. Sometimes the puzzle consists of a miniature ship or other device inclosed within an object which has no opening of sufficient size to admit the passage of the inclosure. Of this class
It is known as rose-copper. See copper-furnace. 2. (Mill.) A circular arrangement of sails in a windmill; the vanes attached to radial arms. 3. A leather or metallic ornament placed on a bridle or halter at the point — where the front joins the crown-piece. 4. A circular ornament of fabric, plaited with leaves somewhat resembling those of a flower. 5. (Gas.) A form of gas-burner in which the gas issues at a circular series of holes resembling a rosette. See stove-burner. Ross′ing–ma-chine′. 1. A machine for removing the ross, or rough, scaly, exterior portion of bark, from the remainder. 2. A machine for removing bark from logs in advance of the saw. The bark, containing much silex and sometimes grit, soon dulls the saw. See Fig. 4451. 3. A machine for cutting up bark for steeping or boiling. The vegetable extract is used for tanning, medicine, dyeing, etc. In the most correct sense, the removal of the outer cuticle, there are several processes.
render it impermeable and to prevent erasures or chemical action. Ross, 1854. Water-lining or printing the denomination of the note in col859. 28,959BoothJuly 3, 1860. 30,031WashburnSept. 11, 1860. 31,829RossMar. 26, 1861. 31,897MallaryApr. 2, 1861. 32,007ShawApr. 9, 1861. 134,303MillsDec. 24, 1872. 135,047SheffieldJan. 21, 1873. 138,764Ross et al.May 13, 1873. 140,586MillerJuly 8, 1873. 145,687RichardsonDe class H. — tables and stands. 1. Tables. No.Name.Date. 31,044Ross et al.Feb. 26, 1861. 41,393PilbeamJan. 26, 1864. 42, 318StoopsApr. 3, 1874. 157,185AdamsNov. 24, 1874. 2. Cases and Cabinets. 20,664Ross et al.June 22, 1858. 22,464UhlingerDec. 28, 1858. 114,435GroveMay stripping off the envelope of wool, which is then ready for combing. Ross's English patent, 1851. 2. (Tobacco.) A machine for smoothing tes of bone, horn, or wood. firmly lashed together. In Boothia, Captain Ross saw sleds in which the runners were made of salmon, packed into
en known to be over five and a half minutes in making a single revolution, moving regularly all this time, however, and capable of automatically increasing the rate almost immediately to more than 30 revolutions a minute. The Holly Water-Works in various cities of the Union have also an automatic regulator. The first engine known to have been thus automatically regulated was one at Ross, Herefordshire, England. In that town, in 1720, John Kyrle, celebrated in Pope's Elegy as the Man of Ross, established a system of water supply for that town, which, from that time to the present has been uninterruptedly in use. The distinctive feature of this system consists in forcing water by pumps into the street mains, so as to supply the town with water under such pressure as may be required. At the Ross works, the ordinary pressure for many years has been 45 pounds per square inch. Steam-power has been substituted for the old water-wheels long since. Wat′tle. A fence, panel, scree