Section (probably for training purposes) through a <a href="https://en.wikipedia.org/wiki/Curtiss_OX-5" class="extiw" title="w:Curtiss OX-5">Curtiss OX-5</a> V8 aircraft engine, showing the front pair of cylinders, with cutaways through the cylinder walls and one piston. The section passes through the crankcase, crankshaft, and oil sump, showing the channels for lubrication oil that pass through the crankcase and around the crankshaft.<br><br>Original comment: "Any ideas what kind of engine this is? From the Robert McKenzie fonds, PR1991.0305/45."
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/95711690@N03">Provincial Archives of Alberta</a>
1916
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