line standardn.

Brit.

/ˈlʌɪn ˌstandəd/, U.S.

/ˈlaɪn ˌstændərd/

Etymology: line n.²

a. Metrology. A standard of length in the form of a metal bar on which are engraved two lines, the distance between which (under specified conditions) is the standard length.

ΘΚΠ

the world > relative properties > measurement > measurement of length > [noun] > standard of length

end standard1888

line standard1888

1888 Encycl. Brit. XXIV. 478/1 Standards of length are of two types, the defining points being either at a certain part of two parallel lines engraven in one plane (a line-standard), or else points on two parallel surfaces, which can only be observed by contact (an end-standard).

1906 W. Hallock & H. T. Wade Outl. Evol. of Weights & Measures x. 223 The line standard, of course, can be used with a microscope with cross-hairs, or a micrometer microscope, much more readily than an end standard.

1966 G. W. C. Kaye & T. H. Laby Tables Physical & Chem. Constants (ed. 13) 7 The yard equal to 0·9144 metre supersedes the definition in terms of the former imperial standard yard, a bronze line-standard constructed in 1845.

1967 A. J. T. Scarr Metrol. & Precision Engin. v. 67 The calibration of a line standard is determined by comparison with a master scale.

b. Television. The number of lines constituting a complete picture.

ΘΚΠ

society > communication > broadcasting > television > visual element > [noun] > picture elements, lines, or rasters

picture element1925

line1929

scanning line1929

scanning field1935

scanning raster1935

field1938

line standard1959

pixel1965

1959 C. Daniel in Rep. Comm. Broadcasting 1960 (1962) 340 in Parl. Papers 1961–2 (Cmnd. 1753) IX. 259 We understand that most of the rest of Europe are likely to adopt..a line standard of 625 lines.

1973 Newnes Colour Television Servicing Man. I. i. 2/2 The degaussing action takes place automatically when there is a change in the line standard during push-button selection.

This entry has not yet been fully updated (first published 1976; most recently modified version published online March 2022).

单词	line standard
释义	line standardn. Brit. /ˈlʌɪn ˌstandəd/, U.S. /ˈlaɪn ˌstændərd/ Etymology: line n.² a. Metrology. A standard of length in the form of a metal bar on which are engraved two lines, the distance between which (under specified conditions) is the standard length. ΘΚΠ the world > relative properties > measurement > measurement of length > [noun] > standard of length end standard1888 line standard1888 1888 Encycl. Brit. XXIV. 478/1 Standards of length are of two types, the defining points being either at a certain part of two parallel lines engraven in one plane (a line-standard), or else points on two parallel surfaces, which can only be observed by contact (an end-standard). 1906 W. Hallock & H. T. Wade Outl. Evol. of Weights & Measures x. 223 The line standard, of course, can be used with a microscope with cross-hairs, or a micrometer microscope, much more readily than an end standard. 1966 G. W. C. Kaye & T. H. Laby Tables Physical & Chem. Constants (ed. 13) 7 The yard equal to 0·9144 metre supersedes the definition in terms of the former imperial standard yard, a bronze line-standard constructed in 1845. 1967 A. J. T. Scarr Metrol. & Precision Engin. v. 67 The calibration of a line standard is determined by comparison with a master scale. b. Television. The number of lines constituting a complete picture. ΘΚΠ society > communication > broadcasting > television > visual element > [noun] > picture elements, lines, or rasters picture element1925 line1929 scanning line1929 scanning field1935 scanning raster1935 field1938 line standard1959 pixel1965 1959 C. Daniel in Rep. Comm. Broadcasting 1960 (1962) 340 in Parl. Papers 1961–2 (Cmnd. 1753) IX. 259 We understand that most of the rest of Europe are likely to adopt..a line standard of 625 lines. 1973 Newnes Colour Television Servicing Man. I. i. 2/2 The degaussing action takes place automatically when there is a change in the line standard during push-button selection. This entry has not yet been fully updated (first published 1976; most recently modified version published online March 2022). < n.1888
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