g commonly used. In construction itis a cylinder, A, of any elastic sub- stance nog affected by oil, placed between two wash, ers about ‘the well tube.- The cylinder is slightly smaller than the bore of the well, and is easily let down therein, but on reaching its position it is com- ‘pressed by… … H, is open. When it is closed, the water passes on on a fixed washer, and has also four ribs, D, to hold up the escape-pipe, F, and falls back into the tank, it from turning while the tube is screwed up. [t will B. Before steam is generated in the waterback, the be seen that the thread is not…
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