sensitometern.

Brit.

/ˌsɛnsɪˈtɒmᵻtə/, U.S.

/ˌsɛnsəˈtɑmədər/

Forms: 1800s– sensitometer, 1800s– sensitometre (rare).

Origin: Formed within English, by derivation. Etymons: sensitive adj., -ometer comb. form.

Etymology: < sensit- (in sensitive adj.) + -ometer comb. form.

Photography.

An instrument used to measure the sensitivity of photographic film, plates, etc., to light or radiation. Frequently attributive. Cf. actinometer n. 2. Sensitometers expose areas of film to light or radiation of standard intensity for increasing exposure times. At a standard intensity of light or radiation, film that is less sensitive will take more time to produce the same image density. Cf. film speed n. 1.

ΘΚΠ

society > leisure > the arts > visual arts > photography > camera > parts and accessories of camera > [noun] > meters

photographometer1848

heliograph1851

actinometer1866

sensitometer1880

light meter1889

exposure meter1891

iconometer1894

extinction meter1931

1880 Brit. Jrnl. Photogr. 3 Sept. 421/3 [Mr. Warnerke's] very useful ‘sensitometer’.

1889 P. H. Emerson Naturalistic Photogr. i. vi. 159 The rapidity of plates can be measured by an instrument called a sensitometer.

1890 Internat. Ann. Anthonys Photogr. Bull. 372 The lower grades of dry plates, that is, those of low sensitometer power.

1901 Waterloo (Indiana) Press 8 Aug. 6/5 The so-called sensitometer number of dry plates is a delusion. Why plate-makers keep it up is one of the things photographers cannot explain.

1942 C. B. Neblette Photogr. (ed. 4) xiii. 419 The ratio of the exposures between consecutive steps on the Scheiner sensitometer is as 1:1·27.

1972 Jrnl. University Film Assoc. 24 62/1 A complete processing laboratory is located in the basement of the Film Department building. It includes a modern sensitometer and densitometers, several up-to-date printers (including 35mm), [etc.]

2002 J. T. Bushberg et al. Essent. Physics Med. Imaging (ed. 2) vii. 186 To expose the film to various exposure levels, the sensitometer shines light through an optical step tablet, which is a sheet of film that has different density steps on it.

This entry has been updated (OED Third Edition, December 2016; most recently modified version published online March 2022).

单词	sensitometer
释义	sensitometern. Brit. /ˌsɛnsɪˈtɒmᵻtə/, U.S. /ˌsɛnsəˈtɑmədər/ Forms: 1800s– sensitometer, 1800s– sensitometre (rare). Origin: Formed within English, by derivation. Etymons: sensitive adj., -ometer comb. form. Etymology: < sensit- (in sensitive adj.) + -ometer comb. form. Photography. An instrument used to measure the sensitivity of photographic film, plates, etc., to light or radiation. Frequently attributive. Cf. actinometer n. 2. Sensitometers expose areas of film to light or radiation of standard intensity for increasing exposure times. At a standard intensity of light or radiation, film that is less sensitive will take more time to produce the same image density. Cf. film speed n. 1. ΘΚΠ society > leisure > the arts > visual arts > photography > camera > parts and accessories of camera > [noun] > meters photographometer1848 heliograph1851 actinometer1866 sensitometer1880 light meter1889 exposure meter1891 iconometer1894 extinction meter1931 1880 Brit. Jrnl. Photogr. 3 Sept. 421/3 [Mr. Warnerke's] very useful ‘sensitometer’. 1889 P. H. Emerson Naturalistic Photogr. i. vi. 159 The rapidity of plates can be measured by an instrument called a sensitometer. 1890 Internat. Ann. Anthonys Photogr. Bull. 372 The lower grades of dry plates, that is, those of low sensitometer power. 1901 Waterloo (Indiana) Press 8 Aug. 6/5 The so-called sensitometer number of dry plates is a delusion. Why plate-makers keep it up is one of the things photographers cannot explain. 1942 C. B. Neblette Photogr. (ed. 4) xiii. 419 The ratio of the exposures between consecutive steps on the Scheiner sensitometer is as 1:1·27. 1972 Jrnl. University Film Assoc. 24 62/1 A complete processing laboratory is located in the basement of the Film Department building. It includes a modern sensitometer and densitometers, several up-to-date printers (including 35mm), [etc.] 2002 J. T. Bushberg et al. Essent. Physics Med. Imaging (ed. 2) vii. 186 To expose the film to various exposure levels, the sensitometer shines light through an optical step tablet, which is a sheet of film that has different density steps on it. This entry has been updated (OED Third Edition, December 2016; most recently modified version published online March 2022). < n.1880
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