apertometern.
/apəˈtɒmɪtə/ An appliance attached to a microscope for determining the angular aperture of object-glasses.
ΘΚΠ
the world > physical sensation > sight and vision > optical instruments > magnification or magnifying instruments > [noun] > microscope > combined with other instruments
microspectroscope1867
polarization microscope1870
apertometer1880
1880 Nature 4 Mar. 433/1 Some remarks on the apertometer.
1881 Athenæum 26 Nov. 707/3 An Abbe apertometer of dense glass for measuring apertures up to 1·50 N.A.
This entry has not yet been fully updated (first published 1885; most recently modified version published online March 2018).
<
n.1880