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单词 log-glass
释义

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log-glass
log-glass n. (see quot. 1858).
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
1814 Sailor's Return ii. iii, in J. Galt New Brit. Theatre II. 319 As sure as a can of grog, or allowance, is only left but the time of a log-glass, so sartain [sic] is to be purloin'd.
1858 P. L. Simmonds Dict. Trade Products Log-glass, a half-minute sandglass used on board ship for timing the speed of sailing, by the quantity of line run out in a given time.
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