Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . cylinder. The cylinders in Fig. 2099 are externally tangent, and it is obvious that if the helix onone be right-handed, that on the other will be left-handed. An annular wheel, with its pinion, maybe also made with twisted teeth in the same manner. In this case, the larger pitch-cylinder beinginternally tangent to the smaller, the helices will be either right-handed or left-handed on it will readily be seen that a wheel gearing with a rack may be modified in the same way: each
Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . cylinder. The cylinders in Fig. 2099 are externally tangent, and it is obvious that if the helix onone be right-handed, that on the other will be left-handed. An annular wheel, with its pinion, maybe also made with twisted teeth in the same manner. In this case, the larger pitch-cylinder beinginternally tangent to the smaller, the helices will be either right-handed or left-handed on it will readily be seen that a wheel gearing with a rack may be modified in the same way: eachlamina of the rack being advanced beyond the succeeding one to the same extent, in twisting thewheel uniformly, it is clear that the tooth-surfaces of the former will be composed of right lines,oblique to the plane of rotation. And when the teeth of the wheel ultimately become helical ele-ments of the pitch-cylinder, those of the rack will become right lines in the tangent-plane, coincidingwith the developments of those helices. The pressure in the direction of the axes, above mentioned,may be neutralize
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