Inside Out Library
Appleton's dictionary of machines, mechanics, engine-work, and engineering : illustrated with four thousand engravings on wood ; in two volumes (1873)
D. Appleton and Company · New York : D. Appleton and Co. · leaf 732
A o o s x … ©° The feet A A, as above described, are worked by the double wipers C C C C on the wiper shaft I,tese wipen being set pair and pair at right angles to each other, work the feet alternately; so thatwhen one foot is being caught by its wiper, the other is at that moment being released. The feet…Mechanical engineering · Mechanics · Engineering
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