Next, in order to cut this snarled and prostrate grain without missing any of it, the knife must have two motions: its forward motion, as drawn by the horses, and also a slashing sideways motion of its own. How was this to be done? McCormick's first thought was to cut the grain with a whirling wheel-knife, but this plan presented too many new difficulties. Suddenly the idea came to him—why not have a straight blade, with a back and forward motion of its own? This was the birth-idea of the reciprocating blade, which has been used to this day on all grain-cutting machines. It was not, like the divider, a wholly new conception; but Cyrus McCormick conceived it independently, and did more than any one else to establish it as the basic feature of the Reaper.
The third problem was the supporting of the grain while it was being cut, so that the knife would not merely flatten it to the ground. McCormick solved this by placing a row of fingers at the edge of the blade. These fingers projected a few inches, in such a way that the grain was caught and held in position to be cut. The shape of these fingers was afterwards much improved, to prevent wet grain from clogging the slit in which the knife slid back and forth.
A fourth device was still needed to lift up and straighten the grain that had fallen. This was done by a simple revolving reel, such as fishermen use for the drying of their nets. Several of the abortive Reapers that had been tried elsewhere had possessed some sort of a reel; but McCormick made his much larger than any other, so that no grain was too low to escape it.
The fifth factor in this assembling of a Reaper was the platform, to catch the cut grain as it fell; and from which the grain was to be raked off by a man who walked alongside of it. The sixth was the idea of putting the shafts on the outside, or stubble side, of the Reaper, making it a side-draught, instead of a "push" machine. And the seventh and final factor was the building of the whole Reaper upon one big driving-wheel, which carried the weight and operated the reel and cutting-blade. The grain-side end of the blade was at first supported by a wooden runner, and later—the following year—by a small wheel.
FIRST PRACTICAL REAPING MACHINE
Built and used by Cyrus Hall McCormick on Walnut Grove Farm, Va., in 1831
Such was the making of the first practical Reaper in the history of the world. It was as clumsy as a Red River ox-cart; but it reaped. It was made on right lines. The "new principle" that the youth McCormick laboriously conceived in the little log workshop became the basic type of a wholly new machine. It has never been displaced. Since then there have been 12,000 patents issued for reaper and mower inventions; but not one of them has overthrown the type of the first McCormick Reaper. Not one of the seven factors that he assembled has been thrown aside; and the most elaborate self-binder of to-day is a direct descendant of the crude machine that was thus created by a young Virginian farmer in 1831.
The young inventor toiled "laboriously," he says, to complete his Reaper in time for the harvest of 1831. He was very nearly too late, but a small patch of wheat was left standing at his request; and one day in July, with no spectators except his parents and his excited brothers and sisters, Cyrus put a horse between the shafts of his Reaper, and drove against the yellow grain. The reel revolved and swept the gentle wheat downwards upon the knife. Click! Click! Click! The white steel blade shot back and forth. The grain was cut. It fell upon the platform in a shimmering golden swath. From here it was raked off by a young laborer named John Cash. It was a roughly done specimen of reaping, no doubt. The reel and the divider worked poorly. But for a preliminary test it was a magnificent success. Here, at last, was a Reaper that reaped, the first that had ever been made in any country.
The scene of this first "reaping by horse-power" was then, and is to-day, one of unusual beauty. The field is near by the farm-house, rolling in several undulations to the rim of a winding little rivulet. In the centre of the field is a single tree, a wide-branched white oak, which was probably born before the first colonists arrived at Jamestown. And in the background, not more than two miles distant, rise the tall and jagged crags of the Blue Ridge, twelve sharp peaks flung high from deep ravines, on which the lights and shades are incessantly changing,—a most impressive staging for the first act of the drama of the Reaper.