Aperture
The Optical Dictionary · 1904 · p. 2
The diameter of the effective portion of the object-gla in a telescope or other optical instrument; the perforation in the top of an optical instrument.
Bu kavram başka kaynaklarda da geçiyor
Stedman's Medical Dictionary: A Practical Medical Dictionary (1920)
The American Dictionary and Cyclopedia (1910)
Chamber's Twientieth Century Dictionary (1908)
An Illustrated Dictionary of Medicine, Biology and Allied Sciences (1907)
The Student's Medical Dictionary (1896)
Chamber's Etymological of the English Language (1895)
An Illustrated Encyclopaedic Medical Dictionary (1891)
contra-aperture
—
The American Illustrated Medical Dictionary (1913)
Screw-aperture
—
Illustrated Marine Encyclopedia (1890)
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