. Elementary lessons in the physics of agriculture . 40. The Tread Power.— This method of transferring energy is a practical application of the inclined plane, and the amount Avhich can be transmitted by it depends upon the height of the plane as compared with its length. If the length of the tread is eight feet and it is given a slant of one foot in eight feet, then from the equation P. X Length^W. x Height we get, with two thousand four hundred pounds as the weight of two horses, R X 8=2400 X1, whence lbs., as the intensity of the power exerted, diminished, of course, by whatever fric
. Elementary lessons in the physics of agriculture . 40. The Tread Power.— This method of transferring energy is a practical application of the inclined plane, and the amount Avhich can be transmitted by it depends upon the height of the plane as compared with its length. If the length of the tread is eight feet and it is given a slant of one foot in eight feet, then from the equation P. X Length^W. x Height we get, with two thousand four hundred pounds as the weight of two horses, R X 8=2400 X1, whence lbs., as the intensity of the power exerted, diminished, of course, by whatever friction there may be. What would be the power if the slant were made one foot in seven feet? one foot in six feet? one foot in five feet? 41. Traction on Common Roads—The power re- quired to draw a wagon over common roads varies with the character and condition of the road. Experiments in Eng- land with a four-wheeled wagon have given the following results for level roads as indicated by a dynamometer: On cubical block pavement 28 to 44 lbs. per ton. On macadam road 55 to 67 lbs. per ton. On gravel road lbs. per ton. On plank road 27 to 44 lbs. per ton. On common dirt roads 179 to 268 lbs. per ton. 42. Traction Power of a Horse.— According to the most reliable data available at present, which is certainly
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