A 3-pulley hayfork carrier for wooden track. The large knot above the right pulley holds the draft rope to the carrier. The lighter pull-back rope is tied to the knot and if knot-passing draft pulleys are used, the pull-back rope can be used to pull the draft rope back through the carrier to reverse the direction of operation. The trip block is bolted to the bottom of the track at the right of the carrier.
From a 1936 F.E. Myers & Bro. Company catalog