focusern.

Brit.

/ˈfəʊkəsə/, U.S.

/ˈfoʊkəsər/

Forms: 1800s– focuser, 1800s– focusser.

Origin: Formed within English, by derivation. Etymons: focus v., -er suffix¹.

Etymology: < focus v. + -er suffix¹.

1. A device, apparatus, or control used for bringing an image into focus, typically consisting of a mechanism that allows the position of one or more lenses to be adjusted; (in early use also) a focusing glass.

ΘΚΠ

the world > physical sensation > sight and vision > optical instruments > magnification or magnifying instruments > [noun] > microscope > parts of

object plate1664

slider1703

pout1832

indicator1837

substage1853

focuser1861

nosepiece1867

searcher1870

Abbe condenser1879

eyeshade1885

society > leisure > the arts > visual arts > photography > camera > parts and accessories of camera > [noun] > lens > other lens attachments

focuser1861

rangefinder1930

beam-splitter1935

starburst1967

1861 Amer. Jrnl. Sci. 82 228 Prof. Rood constructed for me a compound microscope of a power of thirty diameters, which I hoped to be able to employ as a focuser.

1888 Photogr. Times 25 May 244/2 Place one focusser at the edge of the picture on the right, and then at the left, with the candle..at the bottom of the stand-ends, and in line with the object to be photographed.

1903 Lancet 24 Jan. 235/1 The image now thrown on the plain glass focussing screen by the microscope can with the aid of a compound focusser be sought for.

1951 Pop. Photogr. May 104/4 (advt.) Accessories available include filters, thru-the-lens focuser, etc.

2014 I. Morison Amateur's Guide observing & imaging Heavens vii. 104 A focuser can be a useful addition to a Schmidt-Cassegrain telescope and is often bought as an upgrade to the original focuser.

2. Particle Physics. A device or apparatus for deflecting particles towards a single point or focusing them into a beam, typically by passing them through an electrostatic or magnetic field.

ΘΚΠ

the world > matter > physics > atomic physics > particle physics > [noun] > device for focusing

focuser1952

quadrupole1954

1952 Physical Rev. 85 688/1 This ratio agrees exactly with that found by Lindström with a semicircular focuser.

1958 Sci. News 50 60 The stream of molecules..passes through the focuser, which consists of four cylindrical electrodes... Those in the higher of the two energy states are deflected toward the axis of the focuser.

1963 G. Troup Masers & Lasers (ed. 2) viii. 120 An electrostatic focuser and state separator..was used to provide a beam of excited molecules.

2011 Physics Today June 67 (caption) Shown here is the transverse electric field in the plane of the molecular synchrotron's hexapole focusers.

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

单词	focuser
释义	focusern. Brit. /ˈfəʊkəsə/, U.S. /ˈfoʊkəsər/ Forms: 1800s– focuser, 1800s– focusser. Origin: Formed within English, by derivation. Etymons: focus v., -er suffix¹. Etymology: < focus v. + -er suffix¹. 1. A device, apparatus, or control used for bringing an image into focus, typically consisting of a mechanism that allows the position of one or more lenses to be adjusted; (in early use also) a focusing glass. ΘΚΠ the world > physical sensation > sight and vision > optical instruments > magnification or magnifying instruments > [noun] > microscope > parts of object plate1664 slider1703 pout1832 indicator1837 substage1853 focuser1861 nosepiece1867 searcher1870 Abbe condenser1879 eyeshade1885 society > leisure > the arts > visual arts > photography > camera > parts and accessories of camera > [noun] > lens > other lens attachments focuser1861 rangefinder1930 beam-splitter1935 starburst1967 1861 Amer. Jrnl. Sci. 82 228 Prof. Rood constructed for me a compound microscope of a power of thirty diameters, which I hoped to be able to employ as a focuser. 1888 Photogr. Times 25 May 244/2 Place one focusser at the edge of the picture on the right, and then at the left, with the candle..at the bottom of the stand-ends, and in line with the object to be photographed. 1903 Lancet 24 Jan. 235/1 The image now thrown on the plain glass focussing screen by the microscope can with the aid of a compound focusser be sought for. 1951 Pop. Photogr. May 104/4 (advt.) Accessories available include filters, thru-the-lens focuser, etc. 2014 I. Morison Amateur's Guide observing & imaging Heavens vii. 104 A focuser can be a useful addition to a Schmidt-Cassegrain telescope and is often bought as an upgrade to the original focuser. 2. Particle Physics. A device or apparatus for deflecting particles towards a single point or focusing them into a beam, typically by passing them through an electrostatic or magnetic field. ΘΚΠ the world > matter > physics > atomic physics > particle physics > [noun] > device for focusing focuser1952 quadrupole1954 1952 Physical Rev. 85 688/1 This ratio agrees exactly with that found by Lindström with a semicircular focuser. 1958 Sci. News 50 60 The stream of molecules..passes through the focuser, which consists of four cylindrical electrodes... Those in the higher of the two energy states are deflected toward the axis of the focuser. 1963 G. Troup Masers & Lasers (ed. 2) viii. 120 An electrostatic focuser and state separator..was used to provide a beam of excited molecules. 2011 Physics Today June 67 (caption) Shown here is the transverse electric field in the plane of the molecular synchrotron's hexapole focusers. This entry has been updated (OED Third Edition, September 2016; most recently modified version published online March 2022). < n.1861
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