Benjamin, Charles Henry, 1856- [from old catalog], Hoffman, James David, 1868- [from old catalog] joint author · New York, H. Holt and company · leaf 175
he lower ring is supported on a self-adjusting spher-ical collar. The radii of the curvedraces should not be less than two-thirds the diameter of the balls. To guide the balls in two-pointcontact use is sometimes made of acage ring, a flat collar drilled withholes just a trifle larger than theballs… … Fig. 69. 74. Materials and Wear.—The balls themselves are alwaysmade of steel, hardened in oil, tempered and ground. Theyare usually accurate to within one ten-thousandth of an inch.The plates, rings and journals must be hardened and groundin the same way and perhaps are more likely to wear outor…
Machine design
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