546

��Popular Science Monthly

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���'Sci

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��� ��Above, an 8-16 horsepower tractor plowing under a heavy growth of sunflowers

To the left, an illustration which shows that the possible width of furrow cut is much less in proportion to the width of a small round wheel tractor than in the larger outfit. The plow must travel at or near the right-hand side of the tractor or else the tractor must move partially upon the plowed ground, with a loss of tractive power and the undoing of part of the plow's work

Below, a tractor plowing with one drive-wheel

in the furrow. The front wheel in the furrow

helps to steer

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