RO2 R2O5 RO3 R2O7 RO4 ----------------------------------------------- n.
en at two of its approaches to the sun. -- Periodic function (Math.), a function whose values recur at fixed intervals as the variable uniformly increases. The trigonomertic functions, as sin x, tan x, etc., are periodic functions. Exponential functions are also periodic, having an imaginary period, and the elliptic f…
SHELL n.
r of a steam boiler, forming a case to contain the water and steam, often inclosing also flues and the furnace; the barrel of a cylindrical, or locomotive, boiler. -- Shell road, a road of which the surface or bed is made of shells, as oyster shells. -- Shell sand, minute fragments of shells constituting a considerab…
SINE n.
sines. -- Curve of sines. See Sinusoid. -- Natural sines, the decimals expressing the values of the sines, the radius being unity. -- Sine of an angle, in a circle whose radius is unity, the sine of the arc that measures the angle; in a right-angled triangle, the side opposite the given angle divided by the hypotenu…
STARTING a.
from Start, v. Starting bar (Steam Eng.), a hand lever for working the values in starting an engine. -- Starting hole, a loophole; evasion. [Obs.] -- Starting point, the point from which motion begins, or from which anything starts. -- Starting post, a post, stake, barrier, or place from which competitors in a race s…
UNIT n.
as a standard of comparison for others of the same kind, in assigning to them numerical values, as 1 foot, 1 yard, 1 mile, 1 square foot, 1 square yard, 1 cubic foot, 1 peck, 1 bushel, 1 gallon, 1 cent, 1 ounce, 1 pound, 1 hour, and the like; more specifically, the fundamental unit adopted in any system of weights, mea…