APENRADE

apenrade, a town of germany in the prussian province of schleswig, beautifully situated on the apenrade fjord, an arm of the little belt, 38 m. n. of the town of schleswig. pop. (1900) 5952. it is connected by a branch line with the main railway of schleswig, and possesses a good harbour, which affords shelter for a large carrying trade. fishing, shipbuilding and various small factories provide occupation for the population. the town is a bathing resort, as is elisenlund close by. aperture (from lat. _aperire_, to open), an opening. in optics, it is that portion of the diameter of an object-glass or mirror through which light can pass free from obstruction. it is equal to the actual diameter of the cylinder of rays admitted by a telescope.