| 单词 | half-minute | 
| 释义 | half-minuten.Thesaurus »   The half of a minute; a space of thirty seconds; also   half a minute n. Compounds  attrib. and Comb., as  half-minute gun;   half-minute glass n. (Naut.) a sand-glass which determines the time for the running out of the log-line. ΘΚΠ society > travel > travel by water > vessel, ship, or boat > equipment of vessel > navigational aids > 			[noun]		 > device to ascertain ship's speed through water > timer half-minute glass1690 log-glass1814 1690    T. Burnet Theory of Earth  iii. 41  				To calculate..an eclipse, to minutes and half-minutes. 1708    Life N. Frowde 		(1773)	 140  				Half minute Guns were fired the whole Time, and every other Honour shewn to his Memory. 1717    tr.  A. F. Frézier Voy. South-Sea 7  				To answer the Half-minute Glass. 1867    W. H. Smyth  & E. Belcher Sailor's Word-bk. at Glass,  				Half-minute and quarter-minute glasses, used to ascertain the rate of the ship's velocity measured by the log. This entry has not yet been fully updated (first published 1898; most recently modified version published online December 2015). < | 
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