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undulations of a country. Guyot. Relief valve, a valve arranged for relieving pressure of steam, gas, or liquid; an escape valve.

n court, and the sheriff is to return the writ and his proceedings. -- Return flue, in a steam boiler, a flue which conducts flame or gases of combustion in a direction contrary to their previous movement in another flue. -- Return pipe (Steam Heating), a pipe by which water of condensation from a heater or radiator…

Serving to effect reversal, as of motion; capable of being reversed. Reversing engine, a steam engine having a reversing gear by means of which it can be made to run in either direction at will. -- Reversing gear (Mach.), gear for reversing the direction of rotation at will.

Ripple marks, a system of parallel ridges on sand, produced by wind, by the current of a steam, or by the agitation of wind waves; also (Geol.), a system of parallel ridges on the surface of a sandstone stratum.

doo. -- Rock drill, an implement for drilling holes in rock; esp., a machine impelled by steam or compressed air, for drilling holes for blasting, etc. -- Rock duck (Zoöl.), the harlequin duck. -- Rock eel. (Zoöl.) See Gunnel. -- Rock goat (Zoöl.), a wild goat, or ibex. -- Rock hopper (Zoöl.), a penguin of the gen…

of which it receives and communicates reciprocating motion, as in the valve gear of some steam engines; -- called also rocker, rocking shaft, and way shaft.

of pudding made of paste spread with fruit, rolled into a cylindrical form, and boiled or steamed. -- a.

esembling, the motion of a wheel on its axis; rotatory; as, rotary motion. Rotary engine, steam engine in which the continuous rotation of the shaft is produced by the direct action of the steam upon rotating devices which serve as pistons, instead of being derived from a reciprocating motion, as in the ordinary engine…

he sun must cause an equatorial rise of the solar atmosphere. Siemens. Rotative engine, a steam engine in which the reciprocating motion of the piston is transformed into a continuous rotary motion, as by means of a connecting rod, a working beam and crank, or an oscillating cylinder.

A laborer, especially a deck hand, on a river steamboat, who moves the cargo, loads and unloads wood, and the like; in an opprobrious sense, a shiftless vagrant who lives by chance jobs. [Western U.S.]

To travel; to make progress; to be moved by mechanical means; to go; as, the steamboat runs regularly to Albany; the train runs to Chicago.

One employed to solicit patronage, as for a steamboat, hotel, shop, etc. [Cant, U.S.]

A bursting open, as of a steam boiler, in a less sudden manner than by explosion. See Explosion. Modulus of rupture. (Engin.) See under Modulus.

which is held shut by a spring or weight and opens automatically to permit the escape of steam, or confined gas, water, etc., from a boiler, or other vessel, when the pressure becomes too great for safety; also, sometimes, a similar valve opening inward to admit air to a vessel in which the pressure is less than that…

f wind upon sails, as a ship on water; to be impelled on a body of water by the action of steam or other power.

ct of one who, or that which, sails; the motion of a vessel on water, impelled by wind or steam; the act of starting on a voyage.

hall for public entertainments or amusements; a large room or parlor; as, the saloon of a steamboat. The gilden saloons in which the first magnates of the realm . . . gave banquets and balls. Macaulay.

f engraving and cutting glass and other hard substances by driving sand against them by a steam jet or otherwise; also, the apparatus used in the process. -- Sand box. (a) A box with a perforated top or cover, for sprinkling paper with sand. (b) A box carried on locomotives, from which sand runs on the rails in front…

To burn with hot liquid or steam; to pain or injure by contact with, or imersion in, any hot fluid; as, to scald the hand. Mine own tears Do scald like molten lead. Shak. Here the blue flames of scalding brimstone fall. Cowley.

An incrustation deposit on the inside of a vessel in which water is heated, as a steam boiler.