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  • 3932
    P12-200-2921NA Klamath Project - Oregon-California. Side view of trenching equipment in operation. Note how the plastic drainage tubing is stretched out in advance of the trenching machine; November ...
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  • 3933
    P12-200-2922NA Klamath Project - Oregon-California. View of trenching machine. Hopper unit and digging chain have been lifted out of ground; November 1972; Bureau of Reclamation photo by D. W. Stein...
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  • 3934
    P12-200-2923NA Klamath Project - Oregon-California. View of trenching machine starting to excavate a cutoff trench at the outlet end of a closed drain line; November 1972; Bureau of Reclamation photo ...
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  • 3935
    P12-200-2924NA Klamath Project - Oregon-California. View of trenching machine digging a cutoff wall; November 1972; Bureau of Reclamation photo by D. W. Stein
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  • 3936
    P12-200-2925NA Klamath Project - Oregon-California. Hopper and digging chain are being lowered to grade at right angles to an open collector drain prior to the start of a new closed drain line; November ...
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  • 3937
    P12-200-2926NA Klamath Project - Oregon-California. View of hopper unit and digging chain in position to start excavating a new closed drain line; November 1972; Bureau of Reclamation photo by D. W. ...
    Citation
  • 3942
    P12-200-2931NA Klamath Project - Oregon-California. Rear-end view of hopper unit. Pipe is fed out of the round hole at the bottom and cinders are placed around the pipe as it is being extruded from the ...
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  • 3957
    P12-200-2945NA Klamath Project - Oregon-California. Laser Beam Receiving Unit shown attached to trenching machine; December 1972; Bureau of Reclamation photo by D. W. Stein
    Citation
  • 3958
    P12-200-2946NA Klamath Project - Oregon-California. View of Laser Beam Receiving Unit mounted on trencher. Note that the control panel for receiver unit is mounted to the left of controls for trencher; ...
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  • 3959
    P12-200-2947NA Klamath Project - Oregon-California. View alongside of trencher showing horizontal alignment staffs. The operator sighted down the poles and was able to obtain very good alignment; December ...
    Citation