etween their oiled surfaces andthe leather collar is very small, and can scarcely be con-sidered as any practical impediment, whereas the friction inthe screw press under heavy pressures is an absolute barrierto its use, where thp force of a single man is to be applied. Another serious evil in… … oil BRAMAH FKBSS. IjO insuring the steady and vertical ascent of the piston, and thewear on th^e is almost insensible. New leathers are the only repairs which the press «verrequires, and under ordinary pressures these will last manyyears. So that the press seems to possess in a very highdegree the…
Hydrostatics
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