Show farming advanced by new machinery brendin Tren din farm machinery toward durability simplicity speed and convenience of operation says W M hurst of the united states bureau re ot of agricultural engineering probably has affected american agriculture as much as if no not t more than develop development mint of the reaper and steel plow a century ago the gas tractor has be been n an the market for or nearly 40 yeara years kj bt hut only during the past 10 or 12 years lias bas a unit suitable for planting and cultivating row crops for plowing disking and belt work been available of toll ith general purpose tractors manufactured in 1937 nearly 50 per cent were on rubber pneumatic tires not only permit higher speed edin in field operations operation but make possible road hauling with trailers adapting field machinery to use with trac tractors tois says mr hurst constitutes the major recent development in what is generally known as farm implements A new plow for instance may look about the same as its predecessor but on examination it will be found to be made of better material to have greater beam clearance for turning buining under trash the shape of the mold board of iome some is such as to permit higher speed and attachments are available tor for iii increasing creasing effectiveness in turning under cover crops 11 |