sparkovern.

Forms: Also spark-over.

Etymology: < verbal phrase to spark over: see spark v.¹ 1c.Previous versions of the OED give the stress as: ˈsparkover.

= flash-over n.

ΘΚΠ

the world > matter > physics > electromagnetic radiation > electricity > discharge of electricity > [noun] > discharge arc > accidental

flash-over1892

sparkover1915

1915 Standardization Rules Amer. Inst. Electr. Engineers 48 The Spark-over voltage, for a given gap, decreases with decreasing barometric pressure and increasing temperature.

1936 Nature 19 Sept. 509/1 The crackling sound of more or less prolonged duration finishes with a loud crack coincident with the final sparkover.

1942 J. D. Stranathan ‘Particles’ of Mod. Physics xi. 431 The accelerating tube, including a source of ions at one end and the target to be bombarded at the other, must have sufficient length to prevent spark-over along the outside of the tube.

1946 Nature 2 Nov. 603/2 The sparkover voltage of different electrode arrangements in air.

This entry has not yet been fully updated (first published 1986; most recently modified version published online December 2020).

单词	sparkover
释义	sparkovern. Forms: Also spark-over. Etymology: < verbal phrase to spark over: see spark v.¹ 1c.Previous versions of the OED give the stress as: ˈsparkover. = flash-over n. ΘΚΠ the world > matter > physics > electromagnetic radiation > electricity > discharge of electricity > [noun] > discharge arc > accidental flash-over1892 sparkover1915 1915 Standardization Rules Amer. Inst. Electr. Engineers 48 The Spark-over voltage, for a given gap, decreases with decreasing barometric pressure and increasing temperature. 1936 Nature 19 Sept. 509/1 The crackling sound of more or less prolonged duration finishes with a loud crack coincident with the final sparkover. 1942 J. D. Stranathan ‘Particles’ of Mod. Physics xi. 431 The accelerating tube, including a source of ions at one end and the target to be bombarded at the other, must have sufficient length to prevent spark-over along the outside of the tube. 1946 Nature 2 Nov. 603/2 The sparkover voltage of different electrode arrangements in air. This entry has not yet been fully updated (first published 1986; most recently modified version published online December 2020). < n.1915
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