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Pressure wheels, like gravity wheels, should, from theoretical inference, be expected to give a high per cent. of power. The water resting with the whole of its weight against the vanes or abutments, and without chance of escape except by turning the wheel, seems to meet the conditions of realising the whole effect due to the gravity of the water, and such wheels would no doubt be economical if they had not to contend with certain mechanical difficulties that render them impracticable in most cases.
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ONE:At Jupile I saw a pontoon-bridge, not in use for38 the moment. Just before this place a slightly sloping road leads from the hills to the eastern bank of the Meuse and the main road Vis-Lige. Along this road descended at that moment an immense military forceuhlans, cuirassiers, infantry, more cuirassiers, artillery, munition and forage-carts. The train seemed endless, and although I stood there looking at it for quite a long time, the end had not passed me.

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Another principle in planing machines which deserves notice is the manner of driving carriages or platens; this is usually performed by means of spur wheels and a rack. A rack movement is smooth enough, and effective enough so far as a mechanical connection between the driving gearing and a platen, but there is a difficulty met with from the torsion and elasticity of cross-shafts and a train of reducing gearing. In all other machines for metal cutting, it has been a studied object to have the supports for both the tools and the material as rigid as possible; but in the common type of planing machines, such as have rack and pinion movement, there is a controversion of this principle, inasmuch as a train of wheels and several cross-shafts constitute a very effective spring between the driving power and the point of cutting, a matter that is easily proved by planing across the teeth of a rack, or the threads of a screw, on a machine arranged with spur wheels and the ordinary reducing gearing. It is true the inertia of a platen is interposed and in a measure overcomes this elasticity, but in no degree that amounts to a remedy.And what was his answer?Balmayne knelt down there with one of the lamps in his hand. His face was not good to look upon. Leona Lalage watched him eagerly."Yes, yes," Ren said impatiently, "I know all that. Why did you kill him?"
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