Meker-Fisher burners.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/80365963@N00">jasonwoodhead23</a>
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/woodhead/6131556859/">GERMAN BUNSEN</a>