a spectrum formed from the light produced by an electric arc, characteristic of the gas or vapor through which the arc passes.
- Arc tan
. arc tangent
- Arc tangent
the angle, measured in radians, that has a tangent equal to a given number. Symbol: tan −1. Abbreviation: arc tan; arc tangent The inverse of the tangent function.
- Arc welding
welding by means of the heat of an electric arc. Historical Examples One difficulty with arc welding is the lack of skillful operators. Oxy-Acetylene Welding and Cutting Harold P. Manly The same advice applies to arc welding as to the gas flame method but in a lesser degree. Oxy-Acetylene Welding and Cutting Harold P. Manly […]
a chest for valuables, used in medieval Spain and Italy. Historical Examples From the deep water I fished up some coral, and attached to one fragment was a new species of arca. Narrative of the surveying voyages of His Majesty’s ships Adventure and Beagle, between the years 1826 and 1836 Robert FitzRoy Those of arca […]