Brigadier-General <a href="https://en.wikipedia.org/wiki/David_Henderson_(British_Army_officer)" class="extiw" title="w:David Henderson (British Army officer)">D Henderson</a> DSO CB as Director of Military Training in 1912.
Unknown author<span style="display: none;">Unknown author</span> — Not given in Flight magazine, in uploader's library of early military aviation or available by web searching
Published 9 November 1912
Flight magazine (<a rel="nofollow" class="external free" href="http://www.flightglobal.com/pdfarchive/view/1912/1912%20-%201015.html">http://www.flightglobal.com/pdfarchive/view/1912/1912%20-%201015.html</a>)