<p>The position of the mizzen mask aft of the rudder would suggest this is a yawl.  See the other matching image - previous in my photostream.
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<a rel="nofollow" class="external text" href="https://www.flickr.com/people/24469639@N00">whatsthatpicture</a> from Hanwell, London, UK
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/whatsthatpicture/2464879559/">Skipper on board a boat, possibly a ketch, lugger or yawl, early 1900s</a>