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Hydraulic Excavating Machine.

Description: Patent for a new and improved hydraulic excavator. This design "consists in combining a submerged propeller-wheel with a water-jet tube having a flexible connection with the supply-pipe, so as to permit the water-jet tube to rise and fall . . . and also move laterally, whereby the tube will, when it meets an obstruction, yield sufficiently to prevent breaking, jarring, or injuring any of the parts, the water-jet tube and propeller bearing such relative positions to each other that the . . . obs… more
Date: January 15, 1884
Creator: Mansfield, Samuel M.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Ditching-Machine

Description: Patent for "a machine for digging ditches or trenches of any desired depth or width, for purposes of irrigation or drainage or pipe-laying, or for building earth fences on lands, or throwing up fortifications, or for making other excavations of like general nature" (lines 7-13).
Date: December 18, 1888
Creator: Edwards, Charles Clark
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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