The nose cone of a sectioned Atar turbojet. The electrical starter motor can be seen at the center. Also visible is the piping and ducting for the compressed, heated air used to prevent icing on the inlet.
<a href="//commons.wikimedia.org/wiki/User:Ariadacapo" title="User:Ariadacapo">Olivier Cleynen</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>