Patent for a hay-press where "the plunger or traverser is arranged in a suitable frame and is drawn toward its rearward position by means of a spring. rods are connected to the opposite sides of the plunger or traverser, and these are in turn connected to a cross-head, which in turn is connected with a pitman provided on its outer end with a hook that engages mechanism to give it a motion which imparts a reciprocating motion to the plunger" (lines 15-25).