<a href="https://en.wikipedia.org/wiki/William_Howard_Livens" class="extiw" title="en:William Howard Livens">William Howard Livens</a> standing by a display of his <a href="https://en.wikipedia.org/wiki/Livens_Projector" class="extiw" title="en:Livens Projector">Livens Projector</a>.
HM Government
A photo