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• 1. [Image] Closed Drain Construction - Tule Lake Sump 3 - Specs. No. 200C-842, Patterson Constr. Co., Contractor

  	CN-12-201-254NA Klamath Project - Oregon-California. View of receiver unit mounted on top of the trencher. The location of the laser beam is sensed by this unit. This information is passed to an analog ...
  	Citation × Citation Citation Abstract Copy Title: Closed Drain Construction - Tule Lake Sump 3 - Specs. No. 200C-842, Patterson Constr. Co., Contractor Author: United States. Bureau of Reclamation, Stein. D.W. Year: 1973, 2009, 2007 CN-12-201-254NA Klamath Project - Oregon-California. View of receiver unit mounted on top of the trencher. The location of the laser beam is sensed by this unit. This information is passed to an analog computer which operates the hydraulic controls on the trencher. Thus, the receiver unit automatically maintains the digging unit at the desired grade; February 1973; Bureau of Reclamation photo by D. W. Stein Title: Closed Drain Construction - Tule Lake Sump 3 - Specs. No. 200C-842, Patterson Constr. Co., Contractor Author: United States. Bureau of Reclamation, Stein. D.W. Year: 1973, 2009, 2007 CN-12-201-254NA Klamath Project - Oregon-California. View of receiver unit mounted on top of the trencher. The location of the laser beam is sensed by this unit. This information is passed to an analog computer which operates the hydraulic controls on the trencher. Thus, the receiver unit automatically maintains the digging unit at the desired grade; February 1973; Bureau of Reclamation photo by D. W. Stein Close