Photograph of part of 16th century Abingdon Monks' Map which shows a representation of Abingdon Lock with the paddles of a flash lock
<a href="//commons.wikimedia.org/wiki/User:TedColes" title="User:TedColes">TedColes</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>