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Parallel motion linkage
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<p>In <a href="/facts/Kinematics/o7mSyeJA">kinematics</a>, the parallel motion linkage is a <a href="/facts/Six-bar_linkage/zdq7PzlB">six-bar</a> mechanical <a href="/facts/Linkage_(mechanical)/mcQPwQdP"> linkage</a> invented by the Scottish engineer <a href="/facts/James_Watt/29KvGNW0">James Watt</a> in 1784 for the <a href="/facts/Double-acting_cylinder/o0TxbdjM">double-acting</a> <a href="/facts/Watt_steam_engine/FYzx2z2D">Watt steam engine</a>. It allows a rod moving practically straight up and down to transmit motion to a beam moving in an arc, without putting significant sideways strain on the rod. </p>