measured by means of twopointed brass rods which were coated with grease and slidthrough holes in the rubber stoppers. In use the two rods wereraised or lowered by a small worm gear until their points werein the level water surfaces in the bottles, the relative elevationsof the points being then… … [459] 56 BULLETIN OF THE UNIVERSITY OF WISCONSIN or of the water surfaces, it was necessary to deduct from thedifference indicated by the vernier readings a similiar differenceindicated when the air pressure in the bottles was equal, aswhen the tubes were open to the atmosphere. The scale…
Pumping machinery · Compressed air
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