RANGE n.
ause the rays from the near point to appear as if they came from the far point. -- Range finder (Gunnery), an instrument, or apparatus, variously constructed, for ascertaining the distance of an inaccessible object, -- used to determine what elevation must be given to a gun in order to hit the object; a position finde…
RULE n.
. -- Rule of three (Arith.), that rule which directs, when three terms are given, how to find a fourth, which shall have the same ratio to the third term as the second has to the first; proportion. See Proportion, 5 (b). -- Rule of thumb, any rude process or operation, like that of using the thumb as a rule in measur…