This is an awesome video I thought…
Around The Corner - How Differential Steering Works (1937) - YouTube
Love it!
Great video! Cheers!
Now, can someone please explain why when the car is on the hoist and you rotate one wheel forwards, the opposite wheel goes backwards! 
Because the crown wheel & pinion don’t rotate when you turn one wheel by hand. It’s caused by the rotation of the planetary gears - the bevel gear attached to the driveshaft of the rotated wheel turns the floating gears which then turn the other wheel’s bevel gear in the opposite direction.
I’m sure I spotted Pesky in that film