FRICTION IN CULTIVATION.
■•-'■ . * —- : :. ' A NOVEL MEASURER. ;•'"■■ order to determine the energy required to handle ; farm implements, the Agricultural College of the University of | . Nebraska has devised a. unique method. A concrete pit, 160 ft. long and 12Jft. wide, is kept ' filled with soil under uniform conditions, over which the implements are drawn' by an, electric motor-car with a dynamometer 7 attached. Besides determining 'j the various adjustments of implements that require the least energy to accomplish the most,: the relative pull demanded by the different kinds of implements is also, ascertained. "Under the ; soil conditions on the' track,-; it takes 51b. to 71b. of pressure to pull a plough in turning over' one square inch of,soil /that is, if the .plough is running lin. deep and cutting a slice lin. wide. ; An Bft. disc-harrow required 1801b. of j pressure to pull; it when set straight. When this machine is dished or angled to its limit it takes ■4301b;''of pressure to draw it. With the addition of a 1801b. weight the pull is increased ito # 2801b. and 6401b. respectively. This is the general average, for the draft varies ; with the depth and rate. at. which the implement is travelling.
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New Zealand Herald, Volume LX, Issue 18332, 23 February 1923, Page 10
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198FRICTION IN CULTIVATION. New Zealand Herald, Volume LX, Issue 18332, 23 February 1923, Page 10
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