täiustatud Venturi renn vooluhulga mõõtmiseks avasängides
a calibrated device developed by Parshall for measuring the fl ow of liquid in an open conduit consisting essentially of a contracting length, a throat, and an expanding length
canal jaugeur à radier spécialement profilé, suivant le système Parshall, servant à mesurer le débit des eaux usées
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