Portrait of British mathematician Edward Troughton (1753-1835)
Unknown author<span style="display: none;">Unknown author</span>
before 1835 <div style="display: none;">date QS:P,+1835-00-00T00:00:00Z/7,P1326,+1835-00-00T00:00:00Z/9</div>
MacTutor History of Mathematics: <a rel="nofollow" class="external free" href="http://turnbull.mcs.st-and.ac.uk/~history/PictDisplay/Troughton.html">http://turnbull.mcs.st-and.ac.uk/~history/PictDisplay/Troughton.html</a>