Chain boat drive mechanism (drum winch)
Unknown, but diagram from book published in 1868, therefore clearly copyright expired. Originally uploaded at German Wikipedia by <a href="https://de.wikipedia.org/wiki/User:Salino01" class="extiw" title="de:User:Salino01">de:User:Salino01</a>
Architektenverein zu Berlin: Deutsche Bauzeitung, Vol. 2, Verlag Carl Beelitz, 1868, page 100, (<a rel="nofollow" class="external text" href="https://books.google.de/books?id=2pPmAAAAMAAJ&amp;pg=PA100&amp;dq=kettenschifffahrt+elbe&amp;lr=&amp;as_drrb_is=q&amp;as_minm_is=0&amp;as_miny_is=&amp;as_maxm_is=0&amp;as_maxy_is=&amp;as_brr=3&amp;cd=1">Google Books</a>), (description of the first German chain boat between Neustadt and Buckau)