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phases of a scene, are printed on paper and mounted around the periphery of a wheel. The rotation of the wheel brings them rapidly into sight, one after another, and the blended effect gives a semblance of motion.

A very small chevrotain (Tragulus Javanicus), native of Java. It is about the size of a hare, and is noted for its agility in leaping. Called also Java musk deer, pygmy musk deer, and deerlet.

A poisonous organic base (a ptomaine) formed in the decomposition of protagon with boiling baryta water, and in the putrefraction of proteid matter. It was for a long time considered identical with choline, a crystalline body originally obtained from bile. Chemically, however, choline is oxyethyl-trimethyl-ammonium hyd…

instrument or machine for measuring work done, especially for ascertaining the number of rotations made by a machine or wheel in manufacturing cloth; a counter. Ure.

The tendency of a revolving body, when suspended in a certain way, to bring the axis of rotation into parallelism with the earth's axis.

The solid generated by the rotation of a parabola about its axis; any surface of the second order whose sections by planes parallel to a given line are parabolas.

Turning around; rotatory; revolving; as, a peristrephic painting (of a panorama).

Rotatory; circuitous. [R.]

A special form of rotary converter with stationary commutator and rotating brushes, in which the exciting field is induced by the alternating current in a short-circuited magnetic core instead of being produced by an external magnet.

istration and reproduction of audible sounds, as articulate speech, etc. It consists of a rotating cylinder or disk covered with some material easily indented, as tinfoil, wax, paraffin, etc., above which is a thin plate carrying a stylus. As the plate vibrates under the influence of a sound, the stylus makes minute in…

ning very rapidly is illuminated by momentary flashes of light passing through slits in a rotating disk. By properly timing the succession of flashes the wheel is made to appear to be motionless, or to rotate more or less slowly in either direction.

pile. See under Pneumatic. -- Screw pile, one with a screw at the lower end, and sunk by rotation aided by pressure.

ntity (Alg.), an affirmative quantity, or one affected by the sign plus [+]. -- Positive rotation (Mech.), left-handed rotation. -- Positive sign (Math.), the sign [+] denoting plus, or more, or addition.

ts, upon the protuberant matter about the earth's equator, in connection with its diurnal rotation; -- so called because either equinox, owing to its westerly motion, comes to the meridian sooner each day than the point it would have occupied without the motion of precession, and thus precedes that point continually wi…

l or theoretical derivative by the action of heat; as in pyrophosphoric, pyrosulphuric, pyrotartaric, pyrotungstic, etc.

ne side equal to a quadrant or arc of 90º. -- Quadrantal versor, a versor that expresses rotation through one right angle.

oxidation. It is a sour white crystalline substance, consisting of a combination of dextrorotatory and levorotatory tartaric acids. Gregory.

and 2d Ratch. Ratchet brace (Mech.), a boring brace, having a ratchet wheel and pawl for rotating the tool by back and forth movements of the brace handle. -- Ratchet drill, a portable machine for working a drill by hand, consisting of a hand lever carrying at one end a drill holder which is revolved by means of a ra…

An American herb (Crotalaria sagittalis), the seeds of which, when ripe, rattle in the inflated pod.

Any one of several species of venomous American snakes belonging to the genera Crotalus and Caudisona, or Sistrurus. They have a series of horny interlocking joints at the end of the tail which make a sharp ratting sound when shaken. The common rattlesnake of the Northern United States (Crotalus horridus), and the diam…