Mechanics' magazine and register of inventions and improvements . osed to Improved Horse-Shoe. have 50 teeth, b 100, c 200, audi200. a, h,and c, are intended merely to bring the screwdown to its work, or to perform light tasks;and when the winch engages any one ofthem, d is clamped. When the screw is re-quired to do its utmost, the winch is made toengage c and d together: then c, by meansof its hold on the square projection, keepsthe screw going before the nut, while the nutis overtaking it at the rate of one tooth foreach revolution. The construction given inthe figure is one of several, and
Mechanics' magazine and register of inventions and improvements . osed to Improved Horse-Shoe. have 50 teeth, b 100, c 200, audi200. a, h,and c, are intended merely to bring the screwdown to its work, or to perform light tasks;and when the winch engages any one ofthem, d is clamped. When the screw is re-quired to do its utmost, the winch is made toengage c and d together: then c, by meansof its hold on the square projection, keepsthe screw going before the nut, while the nutis overtaking it at the rate of one tooth foreach revolution. The construction given inthe figure is one of several, and not the best,but the one I found least troublesome tocopy. I hope some of your correspondentswill favor us with an opinion of the merits ofthe machine as thus altered, and also with acalculation of its powers, taking for data thewinch at 15 inches radius, the moving powerat 30 pounds, as also, that one revolution ofthe winch passes one tooth, and that one re-volution of the nut d passes one thread ofthe screw, the interval between any twothreads being 2 Improved Horse Shoe. By T. P. [Fromthe Voice of Humanity.]SiK,—I was lately travelling in a coach,early in the morning: it was one of thosemornings which are so distressing to smooth-shod horses. In the night there had been aconsiderable fall of sleet, with a little rain,aad this fall was immediately followed by avery hard frost, so that the road was onecomplete sheet of ice. Coming on so sud-denly, there was no time to get the horsesrough-shod, and their consequent sufferingwas great. They were down and up, firstone and then another, all the wav. in order to get up one little hill, all the were asked to get out and off fromthe coach, and even then it was with thegreatest difficulty that the coachman couldforce the horses up. He was obliged to lash them into madness ; sometimes twowere down together, and once all four weredown at the same time, and when they hadscrambled to the top they were in a pitiables
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