. Effective farming; a text-book for American schools . Fig. 202. — Spike-tooth harrow. Spike-tooth harrows. — A much used type of harrow is the spike-tooth (Fig. 202). These harrows consist of a series of iron teeth fitted into a frame in such a way that they can be adjusted to stand in a vertical position or be slanted either forward or backward. They are useful for stirring and smooth- ing the soil. Blade harrows. — The Acme, or blade harrow, which is shown in Fig. 203, consists of a row of blades that slice and turn the soil. This harrow pulverizes and smoothes the soil, espe-

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear