780Cm0207: Looking upstream at tipping bucket pouring water into trough of automatic silt sampler at Bellvue Hydraulic Laboratory
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Ralph Parshall and Carl Rohwer developed the apparatus, the "Automatic Silt Sampler for use in connection with the Improved Venturi Flume." For more information see "88. Sand and Silt Sampler, Bellvue Laboratory, 1929" in the Irrigation Research Papers, Water Resources Archive, CSU Archives and Special Collections.