alone, or for plowing and har- experiments upon this principle have shown a very stances, gives a solid foundation for the massive en- rowing, as the case may be. When in the field it is serious difficulty in the way of its success. gine to work upon. ~ But take this 16 or 20-tun ma- capable of… … PLOW. poses—such as to saw lumber, do grinding, gin cotton, of resistance that is necessary to be overcome when we and we shall find that it will require the whole of the are dragging, say eight plows, at twelve inches depth in power to propel itself, independently of dragging any- thrash and clean…
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