The low-pressure compressor case from a General Electric J79 turbojet engine. The casing is cut out and the stator blades (sometimes called vanes) are clearly visible. Flow was from left to right: the size of the blades decreases as the air density increases.
<a href="//commons.wikimedia.org/wiki/User:Ariadacapo" title="User:Ariadacapo">Olivier Cleynen</a>
<span class="int-own-work" lang="en">Own work</span>