Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics (1892)
Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 184
. per ball, e.pialing an actual surface wear of only j-^q,,^ in. The frame of a bicycle is gcnerallv constructed of weldless steel tube, and consistsessential jiarts. the frf)nt fork and the backbone. )f two In order to give extra strength to the fork, to enable it to resist the torsional strain… … Fig. 3.—Ball-hearing. the point where it is usually brazed to the backbone. This latter is bent and blocked intoshape from a blank of sheet-steel, the sides being usually of a half-round section. Frequently,however, the back fork is simply a prolongation of tlie backbone [troper. The front fork…
Mechanical engineering
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