rod, to the upper end of which is attached a bent lever. To the other arm of the bent lever is connected a hor- izontal rod. This latter passes through stuffing boxes into the air chamber, so as to be controlled from within. (Fig. 3.) The working is easily understood. When the outer is closed, it… … This device has been lately employed upon two air locks at Boom, for sinking pneumatic foundations for a bridge over the Kupel. Two different plans were employed by opposite side supports a rod, which pass- reason of the different situations of the es through the forked rib, and is secured chutes…
Engineering
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