. Farm machinery and farm motors. rally become so racked and splintered thatit cannot be repaired. 433. Anchor posts can be made by setting strong fenceposts in the ground their full length and nailing somestrips across them to hold beneath the earth ; but a bet-ter method is to insert an angle iron in a concrete base,which will support the tower posts. The dimensions ofthe base should be about 18 X 18 inches X 4 feet forsmall mills, and proportionally larger for large mills. 434. Erecting mills.—Windmills over 60 feet highshould be assembled piece by piece, but low towers canbe assembled on t
. Farm machinery and farm motors. rally become so racked and splintered thatit cannot be repaired. 433. Anchor posts can be made by setting strong fenceposts in the ground their full length and nailing somestrips across them to hold beneath the earth ; but a bet-ter method is to insert an angle iron in a concrete base,which will support the tower posts. The dimensions ofthe base should be about 18 X 18 inches X 4 feet forsmall mills, and proportionally larger for large mills. 434. Erecting mills.—Windmills over 60 feet highshould be assembled piece by piece, but low towers canbe assembled on the ground, including windmill head,sails, and vanes, then raised in a manner similar to After the tower has been raised it should be exam-ined and all braces and stays given the same tensionand all nuts tightened. It is also well before the pump 314 FARM MOTORS rod is put in place to drop a plumb bob from the centerof the top of the tower to the intersection of cordsstretched diagonally from the corners of the tower at. FIG. 211—RAISING A TOWER the base. If the plumb bob does not fall on this inter-section, either the braces do not have equal tension orthe anchor posts are not level. 435. Economic considerations of windmills.—Many-manufacturers claim much more power than the wind-mills really develop. This erroneous claim is probablydue to the fact that early experimenters worked withsmall wheels and figured the power of larger ones fromthe law of cubes, which does not seem to hold true inactual practice. It is wrong to say that a good 12-foot steel mill will furnish i in a 20-mile wind andthat a good 16-foot mill will furnish The economic value of a windmill depends upon itsfirst cost, its cost of repairs, and its power. The com-petition in manufacture at present is so great that oftenthe initial cost is kept down at the expense of the othertwo. A mill should have as few moving parts as power of a mill is so small that if there is much
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