Elementary lessons in the physics Elementary lessons in the physics of agriculture elementarylesson01king Year: 1894 32 The two lines of tile are used to prevent water from run- ning under the road-bed from either side to soften up the ground, the surface, when properly made and kept in repair, keeping water from entering from above. 53. Results of General Morin's Experiments in France.— General Morin, after a series of experiments car- ried on at the expense of the French government, reached the following general conclusions regarding roads and carriages: 1. The traction is directly proporti
Elementary lessons in the physics Elementary lessons in the physics of agriculture elementarylesson01king Year: 1894 32 The two lines of tile are used to prevent water from run- ning under the road-bed from either side to soften up the ground, the surface, when properly made and kept in repair, keeping water from entering from above. 53. Results of General Morin's Experiments in France.— General Morin, after a series of experiments car- ried on at the expense of the French government, reached the following general conclusions regarding roads and carriages: 1. The traction is directly proportional to the load, and in- versely proportional to the diameter of the wheel. 2. Upon a paved or hard macadamized road the traction is independent of the width of the tire when it exceeds three to four inches. 3. At a walking pace the traction is the same for carriages with springs as for those without springs, 4. Upon a macadamized or paved road the traction in- creases with the speed above a velocity of two and one-quar- ter miles per hour. 5. Upon soft roads of earth or sand the traction is inde- pendent of the velocity. 6. The destruction of the road is in all cases greater as the diameters of the wheels are less, and it is greater by the use of carriages without springs than of those with them. 54. The Pulley.— This mechanical power consists of a wheel, having a grooved circumference through which a cord or chain may pass, and so mounted as to revolve freely about an axis. Pulleys are spoken of as either fixed or movable, ac- cording as the axis of revolution is stationary or travels with the load it carries. The two types are represented in Fig. 16. ^ ®'-i^
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