How the automobile differential allows a vehicle to turn a corner while keeping the wheels from skidding. Reverse telecine &amp; introduction edited out.
<a href="https://en.wikipedia.org/wiki/Jam_Handy" class="extiw" title="en:Jam Handy">Handy (Jam) Organization</a> (for Chevrolet)
1937
<a rel="nofollow" class="external free" href="https://archive.org/details/Aroundth1937">https://archive.org/details/Aroundth1937</a>