QUANTITY n.
rs. Wharton (Law Dict. ) -- Quantity of matter, in a body, its mass, as determined by its weight, or by its momentum under a given velocity. -- Quantity of motion (Mech.), in a body, the relative amount of its motion, as measured by its momentum, varying as the product of mass and velocity. -- Known quantities (Math.…
RACE n.
ng machine, etc. Race cloth, a cloth worn by horses in racing, having pockets to hold the weights prescribed. -- Race course. (a) The path, generally circular or elliptical, over which a race is run. (b) Same as Race way, below. -- Race cup, a cup given as a prize to the victor in a race. -- Race glass, a kind of fi…
RADIUM n.
minute quantities in pitchblende, and various other uranium minerals. Symbol, Ra; atomic weight, 226.4. Radium was discovered by M. and Mme. Curie, of Paris, who in 1902 separated compounds of it by a tedious process from pitchblende. Its compounds color flames carmine and give a characteristic spectrum. It resembles…
RAPID-FIRE; RAPID-FIRING a.
tomatic guns of not less than one inch caliber, firing a shell of not less than one pound weight, the explosion of each cartridge operating the mechanism for ejecting the empty shell, loading, and firing the next shot, the latter being guns that require one operation of the hand at each discharge, to load the gun. (2)…
RIG v.
e. L'Estrange. To rig a purchase, to adapt apparatus so as to get a purchase for moving a weight, as with a lever, tackle, capstan, etc. -- To rig a ship (Naut.), to fit the shrouds, stays, braces, etc., to their respective masts and yards.
RO2 R2O5 RO3 R2O7 RO4 ----------------------------------------------- n.
atomic wieghts. "In other words, if the elements are grouped in the order of their atomic weights, it will be found that nearly the same properties recur periodically throughout the entire series." The following tabular arrangement of the atomic weights shows the regular recurrence of groups (under I., II., III., IV.,…