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Knight's Mechanical Encyclopedia (ed. Knight), C. (search)
an′dle. A handle attached transversely to the axis of the tool, as that of the auger. One form of dueling-pistols had a cross-handle. Cross—head. （Steam engine.) A bar moving between parallel and straight slides. It is driven by the piston-rod, and by means of a connecting-rod imparts motion to a beam, or to the crank of an axle or shaft. On its ends are the cross-head blocks, which slide between two parallel guides. Sliding journal-boxes. The sliding journal-box (Fig. 1524) is adapted to occupy a slot in a cross-head to which it imparts motion. The box has two taper-cheeks a a and two taper-gibs b b adjustable by screws, so as to set up the boxing to the wrist and the cheeks to the guides in the cross-head. Cross′ing. （Railway.) A casting placed at the rectangular intersection of two railways, where the rails of each track are partly cut away to allow passage to the flanges of the crossing wheels. Cross—jack yard. （Nautical.) a. The yard
Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
of a very thick convex glass, throw out great rays of light which illuminate the path for people that go on foot tolerably well. These lamps were at every tenth house. They fell into disuse, and lanterns were substituted. These bull's-eyes were again introduced in London in 1799. Master Kemming is noted as the enterprising establisher of public lamps in London. His oil lamps eventually gave way to Murdock's gaslamps, 1798; and Winsor, 1803. An order was issued in Paris, in the year 1524, that the inhabitants should keep lights burning, after nine in the evening, before the windows of all houses which fronted the streets; and in October, 1558, large vases filled with pitch, resin, and other combustibles were placed at the corners of the streets, or nearer together if necessary. These, in the next month of the same year, were superseded by lanterns. The lighting arrangements of the streets however, still continued for many years on a very imperfect footing, and travelers s