The tricyclists' indispensable annual and handbook; a guide to the pastime, and complete cyclopaedia on the subject (1883)
Sturmey, Henry · Coventry, Iliffe; Hartford, The Overman Wheel Co · leaf 42
side of the case. The axle has two corresponding grooves turned in it, but rather shallower, and between the axle and bearing-box is inserted a thin cylindrical collar, pierced alternately with ten circular holes, five being immediately between one pair of grooves, and the remaining five… … double ball bearing. — For Revolving Axles.
Tricycles
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
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