Ruhmkorffn.

Brit.

/ˈruːmkɔːf/, U.S.

/ˈrumkɔrf/

Forms: 1800s Ruhmcorff (irregular), 1800s– Ruhmkorff, 1900s– Rühmkorff.

Origin: From a proper name. Etymons: proper name Rühmkorff, Ruhmkorff.

Etymology: < the name of Heinrich Daniel Rühmkorff (1803–77; also spelt Ruhmkorff), German-born inventor, who invented the induction coil. With Ruhmkorff coil n. compare French bobine de Ruhmkorff (1855 or earlier).Rühmkorff moved to England after his apprenticeship, and subsequently to France. He began to spell his name without the umlaut diacritic while living abroad.

Physics. Now chiefly historical.

I. Compounds.

1. Ruhmkorff coil n. (also Ruhmkorff's coil) an induction coil.

ΘΚΠ

the world > matter > physics > electromagnetic radiation > electricity > electrically induced magnetism > electromagnetic induction > [noun] > induction coil

induction coil1837

coil1849

Ruhmkorff coil1850

Ruhmkorff1858

inductor1872

1850 Aide-mémoire to Mil. Sci. II. 88 The most efficient form of apparatus for applying the secondary current is that known as Ruhmkorff's coil.

1890 Science 26 Dec. 363/2 Two Bunsen cells and only a moderate sized Ruhmkorff coil is quite sufficient.

1908 Rep. Brit. Assoc. Advancem. Sci. 1907 621 The aërials connected through the secondary of a peculiarly made Ruhmkorff coil constitute one oscillating system of a low frequency.

1986 A. Pais Inward Bound ix. 168 They compared flame spectra with spark spectra, using..a Rühmkorff coil.

2006 E. Larsen Thunderstruck i. 29 Researchers in England fashioned a powerful Ruhmkorff coil that they then used to fire off a spark forty-two inches long.

II. Simple uses.

2. = Ruhmkorff coil n. at sense 1.

ΘΚΠ

the world > matter > physics > electromagnetic radiation > electricity > electrically induced magnetism > electromagnetic induction > [noun] > induction coil

induction coil1837

coil1849

Ruhmkorff coil1850

Ruhmkorff1858

inductor1872

1858 Proc. Royal Irish Acad. 1853–7 6 428 When only the exterior terminal of the Ruhmkorff is connected with the upper ball, the light is faint and without stratification.

1908 Rep. Brit. Assoc. Advancem. Sci. 1907 622 When the swing is worked up they burst through the spark gap, short-circuiting out the Ruhmkorff.

1995 Radiation Res. 144 125/2 The spark inductor was invented in Paris..; it soon became known as a ‘Ruhmkorff’.

This entry has been updated (OED Third Edition, March 2011; most recently modified version published online March 2022).

单词	ruhmkorff
释义	Ruhmkorffn. Brit. /ˈruːmkɔːf/, U.S. /ˈrumkɔrf/ Forms: 1800s Ruhmcorff (irregular), 1800s– Ruhmkorff, 1900s– Rühmkorff. Origin: From a proper name. Etymons: proper name Rühmkorff, Ruhmkorff. Etymology: < the name of Heinrich Daniel Rühmkorff (1803–77; also spelt Ruhmkorff), German-born inventor, who invented the induction coil. With Ruhmkorff coil n. compare French bobine de Ruhmkorff (1855 or earlier).Rühmkorff moved to England after his apprenticeship, and subsequently to France. He began to spell his name without the umlaut diacritic while living abroad. Physics. Now chiefly historical. I. Compounds. 1. Ruhmkorff coil n. (also Ruhmkorff's coil) an induction coil. ΘΚΠ the world > matter > physics > electromagnetic radiation > electricity > electrically induced magnetism > electromagnetic induction > [noun] > induction coil induction coil1837 coil1849 Ruhmkorff coil1850 Ruhmkorff1858 inductor1872 1850 Aide-mémoire to Mil. Sci. II. 88 The most efficient form of apparatus for applying the secondary current is that known as Ruhmkorff's coil. 1890 Science 26 Dec. 363/2 Two Bunsen cells and only a moderate sized Ruhmkorff coil is quite sufficient. 1908 Rep. Brit. Assoc. Advancem. Sci. 1907 621 The aërials connected through the secondary of a peculiarly made Ruhmkorff coil constitute one oscillating system of a low frequency. 1986 A. Pais Inward Bound ix. 168 They compared flame spectra with spark spectra, using..a Rühmkorff coil. 2006 E. Larsen Thunderstruck i. 29 Researchers in England fashioned a powerful Ruhmkorff coil that they then used to fire off a spark forty-two inches long. II. Simple uses. 2. = Ruhmkorff coil n. at sense 1. ΘΚΠ the world > matter > physics > electromagnetic radiation > electricity > electrically induced magnetism > electromagnetic induction > [noun] > induction coil induction coil1837 coil1849 Ruhmkorff coil1850 Ruhmkorff1858 inductor1872 1858 Proc. Royal Irish Acad. 1853–7 6 428 When only the exterior terminal of the Ruhmkorff is connected with the upper ball, the light is faint and without stratification. 1908 Rep. Brit. Assoc. Advancem. Sci. 1907 622 When the swing is worked up they burst through the spark gap, short-circuiting out the Ruhmkorff. 1995 Radiation Res. 144 125/2 The spark inductor was invented in Paris..; it soon became known as a ‘Ruhmkorff’. This entry has been updated (OED Third Edition, March 2011; most recently modified version published online March 2022). < n.1850
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