A double hay-fork is represented in Fig. 100,
and another in Fig. 101, which consists of two
three-pronged forks connected" by a hinge.
Fig. 102 shows a simple clamp for attaching this
fork to a beam. It is raised and lowered by the double ropes passing over two fixed pulleys
and the one on the elevator-the horse moving twice as fast as the load is raised.
For pitching hay,, or any material which hangs well together, harpoon-forks work most rapidly, but they are obviously not suited for short straw.
Walker's harpoon is a straight bar of metal, appearing almost as simple as a crowbar
(Fig 103). Its point is driven into the hay as far as desired, when a movement at the
handle is made, which turns up the point at right angles (Fig. 104), enabling it to lift a large
quantity of hay. A modification has spurs, which are thrown out on opposite sides. The
combined fork and knife invented by Kniffen and Harrington is an excellent hay-knife when
folded, as shown in Fig. 106, and an efficient elevator when opened, as shown in Fig. 105. At
a trial in Auburn, New York, this fork discharged a load of hay weighing 2,300 pounds, over
a beam, in two minutes.
Fig. 107 represents a hay-stacker, which first elevates the hay, and then swings it around over the stack, dropping it where desired. The horizontal motion of the crane is effected as follows: Two ropes are attached to the whippletree; one, a strong one, to elevate the hay, running on the pulleys at B, C, and D ; and the other, a smaller one, passing the swivel-pulley at A, on the end of the lever B, extending from the foot of the upright shaft. This cord then passes up and over a pulley above the weight E. The weight is about four pounds, and is attached to the end of the smaller cord. At the same time that the horse, in drawing, elevates the fork with its load of hay, the weight E is raised until it strikes the pull of the horse becomes applied to the end of the level B, causing it to revolve, and the stack. As the horse backs, the weight drops again to the ground, taking from under the horse's feet, and the weight of the fork causes the arm of the back over the load. The intended height for raising the hay, before swinging, is regulated by lengthening or shortening the smaller cord, as the arm will not revolve until the weight strikes the pulley under the head- block.