. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . r crimped spoke, corrugated throughout itsentire length, which gives a ceriain amount of elasticity to the wheel. The bearings of the whe(>ls are now invariably made with anti-friction balls interposed be-tween the moving jjarts. :Many have thought that this methixl of easing the running partswas an invention which came in with the improved bicvcle, but such anti-frittion balls androllers had been proposed and il
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . r crimped spoke, corrugated throughout itsentire length, which gives a ceriain amount of elasticity to the wheel. The bearings of the whe(>ls are now invariably made with anti-friction balls interposed be-tween the moving jjarts. :Many have thought that this methixl of easing the running partswas an invention which came in with the improved bicvcle, but such anti-frittion balls androllers had been proposed and ilescrilied for use with axlesas far back as tlieyiar 1787, and otherpatents for similar contrivances were granted in 1701 and in 1704. One of the successful kind of ball-bearings is that known as the ^Eolus l)earing, inwhich the adjustment is concentric, so that the bearing remains perfectly true after adjust-ment. In another form, shown in Fig. .], there are two facing cones, only one of which ismoved in adjusting to take up the side-play or check. One enterprising gentleman by care-ful experiment found that 12 balls in a bearing lost together ^ gr. in weight in running. Fig. 2.—Cushion tire. 1,000 miles, or only ^.^ gr. per ball, 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 pro- CYCLES. 169 duced by the riders pulling upon the steering-handles, it is generally drawn and tapered intoan oval section, wliile the backbone is of circular section, although somewhat tapered toward
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
