roller grip (roʻlergrip)

A device for clutching a traveling-rope, used as a means of traction for railroad-cars. It consists of a set of binding-rollers or wheels controlled by special mechanism so as to grasp or let loose the traveling-rope or -cable at will. roller-lift (rõʻlėr-lift), n. In some printing machines, a small cam which raises the ink distributing roller from the surface of the inking-plate. roller-mill (rõʻlėr-mil), n. 1. Any form of mill for the coarse grinding of grain for feed. Specifically -2. A mill in which wheat is made into flour by a cracking proce , pa ing between sets of rollers arranged consecutively at fixed distances apart. 3. A machine for bruising flaxseed before grinding under edge stones and pre ing. E. H. Knight. 5215 the streams are at their lowest stage in summer, a dam of logs, stones, and brush is roughly built at the lower end of some pool in which the fish have congregated. This rolling-dam being constructed, the stream for some dis tance above the pool is beaten with poles, and the fish are driven down to the deepest water, out of which they are swept with a net. [New Brunswick.] 4. Same as roll, 5.-5. A twist or partial knot by which the thread is secured to the bobbin in lace-making. Dict. of Needlework. Friction of ingungee center rolling. See friction. - Instantaneous center of roll rolling (ro'ling), p. a. 1. Moving on wheels, or as if on wheels. He next e ays to walk, but, downward pre ed, On four feet imitates his brother beast: By slow degrees he gathers from the ground His legs, and to the rolling chair is bound. Dryden, tr. of Ovid's Meta morph., xv. 340. 2. Making a continuous noise resembling the roll of a drum: as, a rolling fire of musketry.3. Wavy; undulating; rising and falling in gentle slopes. The country was what was termed rolling , from some fancied resemblance to the surface of the ocean when it is just undulating with a long "ground-swell." Cooper , Oak Openings, i. 4. Turned over or down with the effect of a roll, or that may be so turned down. Solemn old Thoresby records how he and his cousin "bought each a pair of black silk rolling stockings in Westminster Hall." Quoted in Ashton's Social Life in Reign of Queen Anne, [I. 153. A black and red velvet tartan [waistcoat] with white stripes and a rolling collar. Thackeray , Vanity Fair, lix. Rolling bridge, a drawbridge or a ferry bridge which rolls upon wheels; or a swing bridge supported upon balls moving in a circular path.- Rolling-cam pre . See pre 1.- Rolling circle of a paddle-wheel, the circle described by a point in the paddle-wheel which moves Rollulus dle roller, however, always being one of either pair. The distance between the rollers is regulated by screws at the ends. The section given to the metal in pa ing through the rollers is determined by the shape of the rollers, whether flat or grooved, it being po ible to produce in this way bars having a great variety of sections, adapted for independent or structural uses. The rolling-mill serves also to some extent to clear the metal pa ed through it from impurities. Small rolling-mills with tapering rollers are used to roll short flat metal bars into rings, the pa age between the rollers expanding the outside more than the inside edge, and thus causing the strip to a ume a curved form. See cut under roll, 2 ( a ). 2. One of the trains of rolls with its framework and driving-mechanism used in rolling metal bars, plates, or sheets in a rolling-mill. They are also called rolls, and two - high and three - high rolls according to the number of superimposed rolls in the machine. 3. A rolling-machine for making sheet-gla by rolling the hot metal.-4. A form of leather-rolling machine.