780H0903: Ralph Parshall reading gage for adjustable tube orifice meter test at Bellvue Hydraulic Laboratory
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For more information see "Memorandum Concerning the Adjustable Tube Orifice Meter" in "221. Adjustable Tube Orifice Meter, Dec. 1934-Mar. 1935," Irrigation Research Papers, Water Resources Archive, CSU Archives and Special Collections. Cache la Poudre River visible behind trees.