Mechanism of the Gymnasticon, invented by Francis Lowndes in 1797
Francis Lowndes
1797
<i>The Repertory of Patent Inventions</i>, vol. 6, published T. and G. Underwood, 1797; <a rel="nofollow" class="external text" href="https://books.google.com/books?id=FvU0AAAAMAAJ">scanned copy at Google books</a>