780H0903: Ralph Parshall reading gage for adjustable tube orifice meter test at Bellvue Hydraulic Laboratory
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.