time balln.

Brit.

/ˈtʌɪm bɔːl/, U.S.

/ˈtaɪm ˌbɔl/,

/ˈtaɪm ˌbɑl/

Origin: Formed within English, by compounding. Etymons: time n., ball n.¹

Etymology: < time n. + ball n.¹

Now chiefly historical.

A ball mounted on a vertical rod or pole in a prominent location (typically the top of a tower), down which it is dropped at a predetermined time, thereby providing a precise time signal that may be seen from a distance.The time-ball was devised by Robert Wauchope (1788–1862), Scottish naval officer, as a means of facilitating accurate adjustment of chronometers on board ship; an experimental apparatus was set up at Portsmouth in 1829, and this was followed in 1833 by a permanent installation at the Royal Observatory in Greenwich. Use of this system for maintaining accurate timekeeping declined following the introduction of radio time signals.

ΘΚΠ

the world > time > instruments for measuring time > [noun] > other instruments

time ball1834

time candle1838

chronoscope1846

time globe1858

time disc1879

1834 Mirror Lit., Amusem., & Instr. 23 Pref. p. iii An explanation of the Time Ball at Greenwich Observatory.

1857 Med. Times & Gaz. 1 Aug. 130/1 A time-ball is to be erected at Devonport, which will be dropped by the same electric flash from Greenwich which drops the time-ball in the Strand.

1865 Boston Daily Advertiser 12 June The Naval Officer in charge of Ascension has given notice, that the position and times of dropping the Time Ball at that island have been altered.

1922 Dublin Univ. Cal. 1922–3 320 For the convenience of mariners a time-ball is dropped on week-days on the roof of the Port and Docks Office at one o'clock Greenwich mean time.

1931 Times 6 May 11/4 A time-ball which is electrically controlled from Greenwich Observatory is now displayed in High Holborn.

1933 Times 22 July 7/3 The time ball signals at Sheerness, Portland, and Plymouth are to be discontinued and the apparatus dismantled.

2009 East Kent Mercury (Nexis) 23 Apr. During the summer, the time ball [at Deal] drops every hour from 9am to 5pm, and it also operates at midnight on New Year's Eve.

This entry has been updated (OED Third Edition, March 2012; most recently modified version published online June 2022).

单词	time ball
释义	time balln. Brit. /ˈtʌɪm bɔːl/, U.S. /ˈtaɪm ˌbɔl/, /ˈtaɪm ˌbɑl/ Origin: Formed within English, by compounding. Etymons: time n., ball n.¹ Etymology: < time n. + ball n.¹ Now chiefly historical. A ball mounted on a vertical rod or pole in a prominent location (typically the top of a tower), down which it is dropped at a predetermined time, thereby providing a precise time signal that may be seen from a distance.The time-ball was devised by Robert Wauchope (1788–1862), Scottish naval officer, as a means of facilitating accurate adjustment of chronometers on board ship; an experimental apparatus was set up at Portsmouth in 1829, and this was followed in 1833 by a permanent installation at the Royal Observatory in Greenwich. Use of this system for maintaining accurate timekeeping declined following the introduction of radio time signals. ΘΚΠ the world > time > instruments for measuring time > [noun] > other instruments time ball1834 time candle1838 chronoscope1846 time globe1858 time disc1879 1834 Mirror Lit., Amusem., & Instr. 23 Pref. p. iii An explanation of the Time Ball at Greenwich Observatory. 1857 Med. Times & Gaz. 1 Aug. 130/1 A time-ball is to be erected at Devonport, which will be dropped by the same electric flash from Greenwich which drops the time-ball in the Strand. 1865 Boston Daily Advertiser 12 June The Naval Officer in charge of Ascension has given notice, that the position and times of dropping the Time Ball at that island have been altered. 1922 Dublin Univ. Cal. 1922–3 320 For the convenience of mariners a time-ball is dropped on week-days on the roof of the Port and Docks Office at one o'clock Greenwich mean time. 1931 Times 6 May 11/4 A time-ball which is electrically controlled from Greenwich Observatory is now displayed in High Holborn. 1933 Times 22 July 7/3 The time ball signals at Sheerness, Portland, and Plymouth are to be discontinued and the apparatus dismantled. 2009 East Kent Mercury (Nexis) 23 Apr. During the summer, the time ball [at Deal] drops every hour from 9am to 5pm, and it also operates at midnight on New Year's Eve. This entry has been updated (OED Third Edition, March 2012; most recently modified version published online June 2022). < n.1834
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