161 PACKUNG . of the bend of the leather . It has been found that when the cup has been made with a square , instead of with a rounde l edge , the joint has not been so water - tight . A form of pack - ing which has been found to answer well in the cylinders of hydraulic capstans is shown in fig .… … Fig . 38 . the bend of the cup . Where the cup leather is placed in a shallow ( instead of a deep ) groove , there is not so much need of the support . The leathers are frequently made far too deep , and this leads to their being more liable to crack , and fail . Gutta - percha or india - rubber…
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