Bible Encyclopedias
Aperture
1911 Encyclopedia Britannica
(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.
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Bibliography Information
Chisholm, Hugh, General Editor. Entry for 'Aperture'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/a/aperture.html. 1910.