Hysplex (ὕσπληγξ) is a starting gate used in ancient Greek horse and foot races. This device was set up at the starting line and consisted of an upright vertical bar that held a horizontal gate attached to it held up by a string. Each racer stood behind his own hysplex and all of the strings were centrally connected behind the runners held...
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http://en.wikipedia.org/wiki/Hysplex
the starting gate that ensured all runners started at the same time in ancient Greece running
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https://www.encyclo.co.uk/local/10135
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