780H0603: "Adjustable tube orifice meter"
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Caption further reads, "Back side of gate showing top of float well, float stem and guide." Title information from "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. See Figure 3.