The most seasoned known application of
a chain drive shows up in the Polybolos, a rehashing crossbow
portrayed by the Greek engineer Philon of Byzantium. Two level joined
fastens were associated with a windlass, which by slowing down and
forward would consequently fire the machine's bolts until its
magazine was vacant. The Greek outline denote the start of the
historical backdrop of the chain drive since no prior occurrence of
such a cam is referred to, and none as perplexing is known until the
sixteenth century. It is here that the level connection chain,
regularly ascribed to Leonardo da Vinci, really showed up. The
principal chain drive in China was delineated in the composed
horological treatise of the Song Dynasty Chinese engineer Su Song,
who utilized it to work the armillary circle of his galactic clock
tower and also the clock jack puppets displaying the time of day by
mechanically blasting gongs and drums. The chain drive itself was
given force through the water driven works of Su's water clock tank
and waterwheel, the last which went about as an extensive rigging.
