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Home > History and Archaeology > History > Annual Report of the Secretary of the State Board of Agriculture of the State of Michigan and Annual Report of the Agricultural College Experiment Station from Volume 1872
Annual Report of the Secretary of the State Board of Agriculture of the State of Michigan and Annual Report of the Agricultural College Experiment Station from Volume 1872

Annual Report of the Secretary of the State Board of Agriculture of the State of Michigan and Annual Report of the Agricultural College Experiment Station from Volume 1872


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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1872 edition. Excerpt: ...the same velocity Sir John Macneill estimates it at GO Ibs. moved 8 miles per day. Mr. Youatt, in his valuable treatise " On Draught," says: "As regards the degree of resistance, when velocity is not required, a force of traction of from 100 Ibs. to 125 Ibs., or even 150 Ibs., according to the strength of the horse, continued for eight hours a day at about two and a half to three miles per hour, is the best proportion of quantity and duration of labor, --that where six or eight miles per hour is required the duration of the day's work should be shortened to 5 or 6 hours and the draught reduced to 80 Ibs. or 100 Ibs. At still higher velocities the draught must not exceed 50 Ibs. or 60 Ibs. and the time of working two or three hours. But this speed can only be attained by the sacrifice of the horse, --and consequently the question will rather be what the horse is capable of doing, than what can be done with economy." From these estimates of the working power of a horse it will be readily seen that the 19 pounds difference in the work performed by two horses working on a mower is a matter of great importance. Let us analyze the proportions of the farm whippletrees mentioned with reference to the influence of a change of position upon the draught. "With a length of 40 inches and with the main draught pin 3i inches back of the line of the whippletree pins, if one end of the doubletree is 5 inches forward of the position it would have when at right angles to the line of draught, the forward horse would be working on the arm of a lever 18.6 inches long, and the horse falling behind would be working on the arm of a lever 20.1 inches long, --a difference in leverage of 1.5 inches. In plowing, with a total draught of 350 pounds (a fair average for two-horse...


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Product Details
  • ISBN-13: 9781154017212
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 92
  • Spine Width: 5 mm
  • Width: 189 mm
  • ISBN-10: 1154017214
  • Publisher Date: 09 Jul 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 181 gr

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Annual Report of the Secretary of the State Board of Agriculture of the State of Michigan and Annual Report of the Agricultural College Experiment Station from Volume 1872
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