780Cm0302: Close-up of timing apparatus for automatic silt sampler at Bellvue Hydraulic Laboratory
Seth Thomas No. 10 clock with attached spider next to circuit relay used as part of Ralph Parshall and Carl Rohwer's apparatus, the "Automatic Silt Sampler for use in connection with the Improved Venturi Flume." Note key in clock box. 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.