. St. Nicholas [serial]. l inthe third hole and described another this he marked off the outer circle with apencil at about every three sixteenths of an every mark he cut a slit toward the exact 587 588 TOM S SUNSHINE ENGINE. [May, center of the disk as far as the inner pencil cir-cle, not a hairbreadth farther. Then, holdingthe disk ever so gently, he turned one little cutprojection in one direction, and the next in theopposite, just as you see in Fig. 2. He then made of cardboard a wheel 8 inchesin diameter, over the center of which, on bothsides, he pasted a small circl
. St. Nicholas [serial]. l inthe third hole and described another this he marked off the outer circle with apencil at about every three sixteenths of an every mark he cut a slit toward the exact 587 588 TOM S SUNSHINE ENGINE. [May, center of the disk as far as the inner pencil cir-cle, not a hairbreadth farther. Then, holdingthe disk ever so gently, he turned one little cutprojection in one direction, and the next in theopposite, just as you see in Fig. 2. He then made of cardboard a wheel 8 inchesin diameter, over the center of which, on bothsides, he pasted a small circle of paper to stiffenthe wheel where the axle came through. Straw uprights, he found, were ever so muchbetter than wooden ones, and he strove withall the care possible as he stuck the needles intothe uprights, as shown in Fig. 1. Through eachof these two vertical straws he thrust a needleat an acute angle upward, and just above wherethese entered he thrust in another at exactlyright angles to each straw. Then through the. THE FLANGED DRIVING-WHEEL. exact center of the flanged wheel he put a stickpin, and on the point of this he pressedthe large wheel. Then he laid this stickpinwith its two wheels on the projecting needles,as shown in Fig. 1. Now he fastened a long straw upright inposition, and attached the straw cross-beam toit with a pin, so that it worked without theslightest friction. To each end of the cross-beam he suspended a split straw, one to serveas a piston, the other as a driving-rod. A pinbent as shown in Fig. 3 was stuck through thecrank-rod and into the fly-wheel. The holespierced in the straws were large enough to pre-vent any but the slightest friction, yet not solarge as to permitthe pinheads to come dangling piston was allowed to move upand down in a writing-paper cylinder. When the engine was completed Toms eyes fairly gleamed with satisfaction, and little Gypjust barked and jumped at him as though shewere equally pleased. Then Tom went to work o
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Keywords: ., bookauthordodgemar, bookcentury1800, bookdecade1870, bookyear1873
