† parallel barn.MechanicsObsolete (in a side-lever steam engine) a bar connecting the piston rods to the side levers, converting vertical motion of the piston into oscillatory motion of the side levers.
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1875 E. H. KnightAmer. Mech. Dict. III. 1630/1Parallel bar, a rod in the side-lever engine, forming a connection with the pump-rods and studs along the center line of the levers.