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Knight's Mechanical Encyclopedia (ed. Knight), G. (search)
ain of experimenters and then a line of practical developers. If the series is to be briefly stated, we shall give it thus; Dr. Clayton, Bishop Watson, Murdoch, Winsor, Clegg; a clergyman, a bishop, an engineer, an enthusiast, a mechanic. In 1726, Dr. Hales, in his work on Vegetable Statics, states that 158 grains of coal yield 180 cubic inches of gas. In 1750, Watson, Bishop of Llandaff, distilled coal, passed the gas through water, and conveyed it in pipes from one place to another. e pressure. Gas-re-tort′. The chamber in which carbonaceous matter is distilled to produce illuminating gas. Dr. Clayton distilled illuminating gas from coal in 1688; the Philosophical Transactions of 1739 refer to the fact. Dr. Hales in 1726 made a quantitative experiment as to the cubic inches of gas obtained from a given number of grains of coal. Lord Dundonald's patent of 1786 was for ovens or retorts in which coal was distilled. Murdoch in 1792 made lighting buildings by gas a s
Knight's Mechanical Encyclopedia (ed. Knight), P. (search)
rsity press, and at that establishment this Dictionary has the honor to be set up. The Faculty of Harvard College was censor till 1662, when licensers of the press were appointed. In 1755 the press was free. A Psalter in the English and Indian languages was printed at the University press in 1709. A printing-press was established in New London, Conn., in 1709; the first printing-press in Turkey was brought from Paris by Mohammed Effendi, in 1721; the first press in Annapolis, Md., was in 1726; Williamsburg, Va., 1729; Charleston, S. C., 1730; Newport, R. I., 1732; Halifax, N. S., 1751; Newbern, N. C., 1755; Portsmouth, N. H., 1756; Savannah, Ga., 1763; Quebec, Canada, 1764. The first press west of the Alleghany range was in Cincinnati, 1793. The first press west of the Mississippi, in St. Louis, 1808. Stereotyping was invented by William Ged of Edinburgh, in 1725; inking-rollers, by Nicholson; composition inking-rollers, by Donkin and Bacon of London, in 1813. The Roman al
Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
ges, their absolute truth or incorrectness may be established; being tried in three binary combinations and shifted end for end and top and bottom, no fault common to them all can escape notice. In Fig. 5939, a b is an elevation and top view of one of Whitworth's long straight-edges; these are from 6 to 10 feet or more in length, made of cast-iron, and ribbed at the back to prevent flexure of the fiducial edge. c is a surface-plate, for verifying plane-surfaces. See plane-surface, page 1726. Straight′en-ing-ma-chine′. （Metal-working.) One for taking the twist or bend out of rails, shafting, bars, rods, and tubes; or the kink and bend out of hoop-iron or wire; or the buckle out of plates. Straight-edge. Fig. 5940 is a railway-rail straightener. It consists of a suite of three or more pairs of rolls, each pair being grooved to correspond in size and shape with the rail to be straightened. The rolls are so arranged that the grooves of the several pairs are perfect<