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McFarlane then switched to selling farm implements, but in the 1930s he became dissatisfied with the harrows he sold and built his own spike-tooth harrow - which is designed to help level the ground after it is tilled with a plow and disc.

McFarlane then switched to selling farm implements, but in the 1930s he became dissatisfied with the harrows he sold and built his own spike-tooth harrow — which is designed to help level the ground after it is tilled with a plow and disc.

The spring-tooth harrow, however, will do fairly well wherever the disk harrow or the spike-tooth harrow is needed.

For other purposes the spike-tooth harrow is better than the spring tooth.

A disk or sharp spike-tooth harrow, used in early spring or after an August rain, will give some fresh earth for covering the seeds.