780Cm0301: Timing apparatus for automatic silt sampler at Bellvue Hydraulic Laboratory
Seth Thomas No. 10 clock with attached spider in center between two circuit relays used as part of Ralph Parshall and Carl Rohwer's 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.