dichroscopen.

Brit.

/ˈdʌɪkrəskəʊp/, U.S.

/ˈdaɪkrəˌskoʊp/

Forms: 1800s dichroöscope, 1800s dichrooscope, 1800s– dichroiscope (now rare), 1800s– dichroscope.

Origin: A borrowing from Greek, combined with an English element. Etymons: Greek δίχρους , -scope comb. form.

Etymology: < ancient Greek δίχρους two-coloured (uncontracted δίχροος: see dichroous adj.) + -scope comb. form, after dichroism n.In German contexts, the instrument and its name (German Dichroskop (1845 or earlier)) are often associated with W. von Haidinger (compare quot. 1851), but it is likely that he borrowed the word from English. With the forms dichroöscope, dichrooscope compare -o- connective. With the form dichroiscope compare -i- connective.

Any of several instruments, typically hand-held, for observing or examining the dichroism of crystals and gemstones, often with a view to identification.

ΚΠ

1830 D. Brewster in Edinb. Encycl. XV. 653/2 We have given the name Dichroscope to those instruments which exhibit the two complementary colours of polarised light... The dichroscope, in its original state, is nothing more than a portable apparatus for exhibiting the experiments of M. Arago and Dr. Brewster on the colours of crystallized plates.

1851 Provinc. Med. & Surg Jrnl. 15 167/2 A crystal of blue or red sapphire is viewed..through Haidinger's dichroiscope.

1890 M. D. Rothschild Handbk. Prec. Stones 15 When a stone is examined by means of the dichroiscope, it will show two images of the same hue, or of different hues.

1909 Jrnl. Royal Soc. Arts 58 62/2 The separation of the rubies from the spinels is..made to a certainty by the use of the dichroiscope.

1922 A. E. H. Tutton Crystallogr. & Pract. Crystal Measurem. II. li. 1116 On rotation of the crystal-plate in its own plane and about the axis of the dichroscope, the tints approach similarity, until at the 45°-positions they are the same.

1969 Materials Res. Bull. 4 541 This again may be measured to a very good degree of accuracy using a dichroscope.

2008 Lapidary Jrnl. Jewelry Artist Apr. 56/1 At first the crystal chips were identified as volcanic glass, then blue spinel..but an alert gemologist..noted it was not cubic as is spinel, and, using a dichroscope, determined it was dichroic.

Derivatives

ˌdichroˈscopic adj. serving as a dichroscope, employing or involving a dichroscope.

ΚΠ

1849 Ann. Rep. Progress Chem. 1 151 If we term the ordinary image of the dichroscopic lens O, and the extraordinary one E, the results of the observations are as follows.

1873 Proc. Royal Soc. 21 503 The dichroscopic lens showed that the colour of thin crystals was distinctly separated into crimson-red and a tint less blue.

1950 Mineral. Mag. 29 170 When making such dichroscopic determinations as have been described, unqualified acceptance of the suggestion..may introduce errors.

1976 tr. A. Frey-Wyssling Plant Cell Wall (ed. 3) iii. 196 The extinction parallel and perpendicular to the axis of parallel textures can be measured with a dichroscopic eye piece.

This entry has been updated (OED Third Edition, March 2014; most recently modified version published online March 2022).

单词	dichroscope
释义	dichroscopen. Brit. /ˈdʌɪkrəskəʊp/, U.S. /ˈdaɪkrəˌskoʊp/ Forms: 1800s dichroöscope, 1800s dichrooscope, 1800s– dichroiscope (now rare), 1800s– dichroscope. Origin: A borrowing from Greek, combined with an English element. Etymons: Greek δίχρους , -scope comb. form. Etymology: < ancient Greek δίχρους two-coloured (uncontracted δίχροος: see dichroous adj.) + -scope comb. form, after dichroism n.In German contexts, the instrument and its name (German Dichroskop (1845 or earlier)) are often associated with W. von Haidinger (compare quot. 1851), but it is likely that he borrowed the word from English. With the forms dichroöscope, dichrooscope compare -o- connective. With the form dichroiscope compare -i- connective. Any of several instruments, typically hand-held, for observing or examining the dichroism of crystals and gemstones, often with a view to identification. ΚΠ 1830 D. Brewster in Edinb. Encycl. XV. 653/2 We have given the name Dichroscope to those instruments which exhibit the two complementary colours of polarised light... The dichroscope, in its original state, is nothing more than a portable apparatus for exhibiting the experiments of M. Arago and Dr. Brewster on the colours of crystallized plates. 1851 Provinc. Med. & Surg Jrnl. 15 167/2 A crystal of blue or red sapphire is viewed..through Haidinger's dichroiscope. 1890 M. D. Rothschild Handbk. Prec. Stones 15 When a stone is examined by means of the dichroiscope, it will show two images of the same hue, or of different hues. 1909 Jrnl. Royal Soc. Arts 58 62/2 The separation of the rubies from the spinels is..made to a certainty by the use of the dichroiscope. 1922 A. E. H. Tutton Crystallogr. & Pract. Crystal Measurem. II. li. 1116 On rotation of the crystal-plate in its own plane and about the axis of the dichroscope, the tints approach similarity, until at the 45°-positions they are the same. 1969 Materials Res. Bull. 4 541 This again may be measured to a very good degree of accuracy using a dichroscope. 2008 Lapidary Jrnl. Jewelry Artist Apr. 56/1 At first the crystal chips were identified as volcanic glass, then blue spinel..but an alert gemologist..noted it was not cubic as is spinel, and, using a dichroscope, determined it was dichroic. Derivatives ˌdichroˈscopic adj. serving as a dichroscope, employing or involving a dichroscope. ΚΠ 1849 Ann. Rep. Progress Chem. 1 151 If we term the ordinary image of the dichroscopic lens O, and the extraordinary one E, the results of the observations are as follows. 1873 Proc. Royal Soc. 21 503 The dichroscopic lens showed that the colour of thin crystals was distinctly separated into crimson-red and a tint less blue. 1950 Mineral. Mag. 29 170 When making such dichroscopic determinations as have been described, unqualified acceptance of the suggestion..may introduce errors. 1976 tr. A. Frey-Wyssling Plant Cell Wall (ed. 3) iii. 196 The extinction parallel and perpendicular to the axis of parallel textures can be measured with a dichroscopic eye piece. This entry has been updated (OED Third Edition, March 2014; most recently modified version published online March 2022). < n.1830
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