- specific-gravity bulb
- noun
: a hollow glass bulb so weighted that it will float on a liquid of greater and sink in a liquid of less specific gravity than that marked on the bulb
Useful english dictionary. 2012.
Useful english dictionary. 2012.
Lactometer — Lac*tom e*ter, n. [L. lac, lactis, milk + meter: cf. F. lactom[ e]tre. Cf. {Galactometer}.] An instrument for estimating the purity or richness of milk, as a measuring glass, a specific gravity bulb, or other apparatus. [1913 Webster] … The Collaborative International Dictionary of English
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