HYDRATTLIC WAGGON DROP . 92 Institute . Fig . 16 shows the means by which water in tbis case … keep the same always sup - plied from the nearest water main . A small ad - justable hole F in the cover communicates with the in - side of the cylinder , to ensure that it is always full of water , and another small hole G in the piston allows any air which may accumulate under the pis ton to pass…
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