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<p>more than one revolution. Duplex chains are another type of chain which are essentially two chains joined side by side which allow for more power and torque to be transmitted.</p>

<p><big>History</big></p>
<p><a href="page.php?w=Image%3AChain_drive%2C_Su_Song%27s_book_of_1092.jpg">thumb</a><a href="page.php?w=Image%3AThe_sketch_%28drawing%29_of_roller_chain%2C_Leonardo_da_Vinci.jpg">thumb</a>The oldest known application of a chain drive appears in the <a href="page.php?w=Polybolos">Polybolos</a>, described by the <a href="page.php?w=History_of_Greece">Greek</a></p><p>
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