British <a href="https://en.wikipedia.org/wiki/Avro_500" class="extiw" title="en:Avro 500">Avro 500</a> military utility aircraft
unattributed
undated; probably ca. 1913-1914
Scanned from Thetford, Owen, <i>British Naval Aircraft Since 1912: Sixth Revised Edition</i>, Annapolis, Maryland: Naval Institute Press, 1991, <a href="//commons.wikimedia.org/wiki/Special:BookSources/0-557-50-076-2" title="Special:BookSources/0-557-50-076-2">ISBN 0-557-50-076-2</a> <span lang="en" dir="ltr" class="error" style="font-size:88%; white-space:nowrap;">Invalid ISBN</span>,  p. 400.