Inconsistency of Rubber Seals on Newcomen Atmospheric Cores

[DougLefelhocz]

The rubber seal on a crude piston inside of a newcomen atmospheric core on a newcomen pump or an oil pumpjack breaks after each use. The rubber seal on a crude piston inside of a newcomen atmospheric core on a multipurpose newcomen engine does not break, no matter whether one uses a newcomen hammer, newcomen roller, newcomen bore, or newcomen lathe.

D3mon1cblack pointed this out a while back.