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otion which is derived from a driver through unyielding intermediate pieces, or by direct contact, and not through elastic connections, nor by means of friction, gravity, etc.; definite motion. -- Positive philosophy. See Positivism. -- Positive pole. (a) (Elec.) The pole of a battery or pile which yields positive or…

can not be included in either of the other two divisions. They manifest themselves in the contact of substances with the organs of taste, touch, and smell, or otherwise affect the living organism, as in the manner of medicines and poisons.

A substance, usually nitrogenous, which is liable to undergo decomposition when in contact with air and moisture at ordinary temperatures.

pyrophorus. Pyrophoric iron (Chem.), finely reduced iron, which ignites spontaneously on contact with air.

-burning furnaces, etc., in which the incoming air or gas is heated by being brought into contact with masses of iron, brick, etc., which have been previously heated by the outgoing, or escaping, hot air or gas.

another without slipping; to bring all the parts of (one line or surface) into successive contact with another, in suck manner that at every instant the parts that have been in contact are equal.

rolling upon another which arises from the roughness or other quality of the surfaces in contact. -- Rolling mill, a mill furnished with heavy rolls, between which heated metal is passed, to form it into sheets, rails, etc. -- Rolling press. (a) A machine for calendering cloth by pressure between revolving rollers.…

ich appear upon a polished surface, as glass, when objects which have been near to, or in contact with, the surface are removed and the surface breathed upon; -- called also Moser's images.

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.

on edge, to affect the teeth with a disagreeable sensation, as when acids are brought in contact with them. -- To set the watch (Naut.), to place the starboard or port watch on duty. -- To set to, to attach to; to affix to. "He . . . hath set to his seal that God is true." John iii. 33. -- To set up. (a) To erect;…

rts of a body to slide relatively to each other in a direction parallel to their plane of contact; -- also called shearing stress, and tangential stress.

produced by the impulse or vibration of the air or other medium with which the ear is in contact; the effect of an impression made on the organs of hearing by an impulse or vibration of the air caused by a collision of bodies, or by other means; noise; report; as, the sound of a drum; the sound of the human voice; a h…

e end of a spar usually projecting from the bow of a vessel, and intended to explode upon contact with an enemy's ships.

al drops or masses, at a temperature several degrees below ebullition, and without actual contact with the heated surface, -- a phenomenon due to the repulsive force of heat, the intervention of a cushion of nonconducting vapor, and the cooling effect of evaporation.

s produced by the extrusion of a viscid, transparent liquid, which hardens on coming into contact with the air; -- said of the spider, the silkworm, etc.

internal, siphunculated shell in the form of a flat spiral, the coils of which are not in contact.

e in which one drives in different directions one's own and the opponent's ball placed in contact.

perature higher than the boiling point corresponding to its pressure. It can not exist in contact with water, nor contain water, and resembles a perfect gas; - - called also surcharged steam, anhydrous steam, and steam gas. -- Wet steam, steam which contains water held in suspension mechanically; -- called also misty…

A line of stout posts or timbers set firmly in the earth in contact with each other (and usually with loopholes) to form a barrier, or defensive fortification. [Written also stoccade.]

To heat, as steam, apart from contact with water, until it resembles a perfect gas.