| 单词 | pear-gauge |
| 释义 | > as lemmaspear-gauge pear-gauge n. now historical and rare a gauge incorporating a pear-shaped glass vessel and a tube with one end dipped into a container of mercury, which measures the air pressure in a vessel from which air has been pumped out. ΘΚΠ society > occupation and work > equipment > pump > [noun] > other parts of pumps pump box1422 pump-staff1422 pump-tree1617 branch1659 pump rod1731 pear-gauge1753 barometer-gauge1783 bucket-door1797 head1824 balance-bob1838 suction primer1875 cup-leather1889 airline1893 1753 J. Smeaton in Philos. Trans. 1751–2 (Royal Soc.) 47 428 Fig. V. Represents the new gage; which I call the pear-gage. 1822 T. Webster Imison's Elem. Sci. & Art (new ed.) I. 155 The pear-gage..shows the true quantity of atmospheric air left in the receiver. 1871 Zell's Pop. Encycl. 577/1 Pear-gage, an instrument for measuring the exhaustion of a receiver. < as lemmas |
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