This machine has been specially developed for boring in all types of ground, and incorporates a very important feature, that of controlling the water immediately if it is tapped. In boring, the hole is first prepared for the reception of a special rubber ring, two iron plates, and two wedges. When these are properly adjusted, the rubber washer is compressed and powerfully gripped on the sides of the borehole to effect a sound and reliable joint. If during boring operations water should rush out and the bore rods cannot be withdrawn, the two handwheels are screwed in; this presses india-rubber plugs onto the bore rods and effects a watertight joint. Mason
Source:
Dictionary of Mining, Mineral, and Related Terms












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