Parts and indication devices of cam-based <a href="https://en.wikipedia.org/wiki/en:analog_computer" class="extiw" title="w:en:analog computer">analog computer</a>
<a href="//commons.wikimedia.org/wiki/User:Twdragon" title="User:Twdragon">Twdragon</a>
<span class="int-own-work" lang="en">Own work</span>