† dietheroscopen.
/dʌɪiːˈθɛrəskəʊp/ Obsolete.
An instrument for measuring variations in atmospheric refraction, usually consisting of a telescope having additional lenses or mirrors which bring two images of any object into the field of vision.
ΘΚΠ
the world > physical sensation > sight and vision > optical instruments > instruments for measuring > [noun] > light or radiation
phaometer1747
photometer1779
diaphanometer1789
lucimeter1825
refractometer1842
Abbe refractometer1876
dietheroscope1877
reflectometer1879
radiomicrometer1887
holophotometer1888
flicker photometer1896
microphotometer1899
diffractometer1909
spot meter1952
photopolarimeter1971
1877 Q. Jrnl. Meteorol. Soc. 3 414 The dietheroscope serves to show every little change of position, apparent or real, of any distant object. Its principal application is the measurement of the variations of atmospheric refraction.
1889 Times 21 Mar. 3/3 There are also Luvini's dietheroscope for observing the changes of atmospheric refraction optically; [etc.].
This entry has not yet been fully updated (first published 1933; most recently modified version published online September 2018).
<
n.1877