The Wheel and cycling trade review . lling mo-tion for sliding; that is, when two pieces, Aand C, either flat or curved, whose surfaceswould ordinarily rub on each other, have aball B placed between them, the intention isthat A shall roll on B and B shall roll on C,or (better stated)/ that A shall roll B on C,thus: : . , , This is so elementary and familiar that tosketch it may seem idle, yet things may losesignificance by being familiar, and we statethis in order to emphasize the essential char-acteristic of a ball bearing, to wit: The ballshould always roll. Here C is stationary,with A and B
The Wheel and cycling trade review . lling mo-tion for sliding; that is, when two pieces, Aand C, either flat or curved, whose surfaceswould ordinarily rub on each other, have aball B placed between them, the intention isthat A shall roll on B and B shall roll on C,or (better stated)/ that A shall roll B on C,thus: : . , , This is so elementary and familiar that tosketch it may seem idle, yet things may losesignificance by being familiar, and we statethis in order to emphasize the essential char-acteristic of a ball bearing, to wit: The ballshould always roll. Here C is stationary,with A and B moving upon it; B should notstick upon C, with A rubbing along on B, norshould B stick to A and the two go rubbingalong together. Figure 9 is intended to represent a portionof a bearing on the same construction as thedouble-ball shown in Figure 6 of our articleDecember 18; whether there are two rows ofballs or only one, or whether the perforatedcollar is used, is only a matter of detail. InFigure 9, which is in vertical section cut. Fid 9 parallel with the axle, C is the stationarybearing-case and AB is the revolving axle rotates upon its centre line FG, roll-ing the ball on the grooved path through thecase C, AB being the axis of rotation of theball. In order not to confuse the lines to theeye, a small space is left between the ball andits, groove, but they are assumed to be reallyin exact contact and fit. Whether anybodyev^r did construct a bearing with the ballsactually in such contact all around we do notsay, although this was understood to be thegeneral construction of the pattern in Figure6 of December 18; but, assuming one to bethus made, how would the balls move? All points on the sides of the ball—thatis, all from L around to the slight opening atV left for clearance between axle and case—not only travel in circles of which line AB iscentre, but travel forward along the groovedpath within C; hence these points on the ballmust more or less slide and rub on
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectcyclist, bookyear1888
