| 释义 |
apertometer|æpəˈtɒmɪtə(r)|
[f. L. apert-us open + -o-meter.]
An appliance attached to a microscope for determining the angular aperture of object-glasses.
1880Nature XXI. 433 Some remarks on the apertometer. 1881Athenæum 26 Nov. 707/3 An Abbe apertometer of dense glass for measuring apertures up to 1·50 N.A. |