Bramah lock, as pictured in Otto's Encyclopedia (Ottův slovník naučný, 1908).
Unknown author<span style="display: none;">Unknown author</span>. The author of the picture is not given, but it is possible that it is <a href="https://cs.wikipedia.org/wiki/s:Autor:Josef_Pokorn%C3%BD_(technik)" class="extiw" title="cs:s:Autor:Josef Pokorný (technik)">Josef Pokorný</a>, the author of the text of the encyclopedia entry.
"Zámek." Ottův Slovník Naučný. Vol. 27. Praha: J. Otto, 1908. 418–420. Print