The inscription reads an athlete called <a href="https://en.wikipedia.org/wiki/Bybon" class="extiw" title="w:Bybon">Bybon</a> threw the stone over his head with one hand.
The original image which was scanned can be located in <a href="https://www.wikidata.org/wiki/Q59628680" class="extiw" title="d:Q59628680"><span title="American sports historian (1864-1930)">Edward Norman Gardiner <small>(Q59628680)</small></span></a> (1864-1930), Olympia Its History &amp; Remains, Oxford: At the Clarendon Press, 1925, Illustration 29, p.97
<a href="//commons.wikimedia.org/wiki/User:RickyBennison" title="User:RickyBennison">RickyBennison</a>
<span class="int-own-work" lang="en">Own work</span>