holophoten.
/ˈhɒləʊfəʊt/ An optical apparatus, used in lighthouses, etc., by which the whole, or nearly the whole, of the light from a lamp or other source is made available for illumination by means of reflective or refractive media or both.
ΘΚΠ
the world > physical sensation > sight and vision > optical instruments > instruments to refract, etc., light > [noun] > holophote
holophote1859
the world > matter > light > reflection > [noun] > objects or substances that reflect light > device for maximizing light
holophote1859
1859 T. Stevenson Lighthouse Illumination 25 The optical arrangement which produces this result may be termed a Holophote.
1862 Rep. Juries Internat. Exhib. xiii. 28 All rays coming from the back of the flame are directed through the holophote.
1882 Athenæum No. 2828. 21 Mr. J. H. A. Macdonald, Q.C., the late Solicitor-General for Scotland, has constructed an ‘electric holophote course indicator’.
1884 Globe 8 July It is the Holophote that reflects the red, white, and blue colours on the cascade, also the parti-colours on the fountains themselves.
Derivatives
holoˈphotal adj. of the nature of or belonging to a holophote; reflecting or refracting all, or nearly all, the light.
ΘΚΠ
the world > matter > light > reflection > [adjective] > relating to or of the nature of types of reflect
holophotal1850
specular1863
the world > physical sensation > sight and vision > optical instruments > instruments to refract, etc., light > [adjective] > holophote
holophotal1850
1850 T. Stevenson in Trans. Scott. Soc. Arts IV. 5 Such a light I have called the ‘holophotal’, or light of maximum intensity.
1851 Rep. Juries Great Exhib. 531 An arrangement of apparatus has been suggested by Mr. Thomas Stevenson..He has..termed it a holophotal system.
1874 F. G. D. Bedford Sailor's Pocket Bk. v. 104 The power of a reflector is much increased by what is termed the holophotal arrangement, where an annular lens is placed in front of the frame, while all the back rays of light, which are otherwise lost, are thrown back into the flame by a hemispherical mirror.
holoˈphotally adv.
ΘΚΠ
the world > matter > light > reflection > [adverb] > using a holophote
holophotally1871
the world > physical sensation > sight and vision > optical instruments > instruments to refract, etc., light > [adverb] > holophote
holophotally1871
1871 R. L. Stevenson in Trans. Scott. Soc. Arts VIII. 274 Another mode of holophotally producing the intermittent light.
holophoˈtometer n. an apparatus for measuring the whole light emitted from a source.
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
1888 Times (Weekly ed.) 11 May 7/2 The holophotometer..is a marvellous apparatus, of great ingenuity, for measuring, by a careful adjustment of mirrors, the intensity of light all round.
This entry has not yet been fully updated (first published 1899; most recently modified version published online June 2021).
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n.1850