Speaking of targeting computers, one of my favorite videos on YouTube is a training film describing the theory of operation behind a purely mechanical fire control computer by the US Navy circa 1953 
<a href="https:&#x2F;&#x2F;youtu.be&#x2F;s1i-dnAH9Y4" rel="nofollow">https:&#x2F;&#x2F;youtu.be&#x2F;s1i-dnAH9Y4</a>