Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 390
sition between the grating and a spheri-cal guard by a central bolt. The shape of the guardgives a uniform flexure to the rubber in lifting, and an easy flow to the current of air and water. The rubber is not closely clampedbetween the guard and plate, as will be seen in the figure,being screwed… … Fig. 856. The lower nut, after
Mechanical drawing
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