Constant bubble indicator
作者： William B Mcdowell
DOI:
关键词: Constant (mathematics) 、 Bubble 、 Materials science 、 Mechanics
摘要:
lens.org 参考文章(3)
Von Hofe Christian, Johann Schier, Box shaped water level ,(1931)
Wickesser Arthur, Giers Clarence A De, Gauge for indicating weight of liquids in tanks ,(1948)
George M Widell, Temperature compensating device ,(1951)