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holophote|ˈhɒləʊfəʊt|
[f. holo- + Gr. ϕῶς, ϕωτ-ός light. (The adj. holophotal was first formed: see below.)]
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.
1859T. Stevenson Lightho. Illumination 25 The optical arrangement which produces this result may be termed a Holophote. 1862Rep. Juries Internat. Exhib. xiii. 28 All rays coming from the back of the flame are directed through the holophote. 1882Athenæum No. 2828. 21 Mr. J. H. A. Macdonald, Q.C., the late Solicitor-General for Scotland, has constructed an ‘electric holophote course indicator’. 1884Globe 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.
So holoˈphotal a., of the nature of or belonging to a holophote; reflecting or refracting all, or nearly all, the light. Hence holoˈphotally adv. holophoˈtometer, an apparatus for measuring the whole light emitted from a source.
1850T. Stevenson in Trans. Scott. Soc. Arts IV. 5 Such a light I have called the ‘holophotal’, or light of maximum intensity. 1851Rep. Juries Gt. Exhib. 531 An arrangement of apparatus has been suggested by Mr. Thomas Stevenson..He has..termed it a holophotal system. 1871R. L. Stevenson in Trans. Scott. Soc. Arts VIII. 274 Another mode of holophotally producing the intermittent light. 1875Bedford Sailor's Pocket Bk. v. (ed. 2) 132 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. 1888Times (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. |