which this put in as shown in Fig. 15, dividing the method of sinking encountered was shaft into hoisting and pumping com- caused by the curve of the caisson ; and partments, and a common "jack-head" this is an avoidable difficulty. The use pump, of 5 inches diameter and 4 feet of hydraulic… … ward by the outer surface of the shoe so as to rest against it at their upper ends. A row of iron rods like those before mentioned were driven over the space where the opening for the drift or gallery was to be made, and just above the sec- ond butt-strap counting from the bottom. The opening was…
Engineering
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