Iskenderian Displacement Guide and Ratio Computer, 1953 Dream Wheel

Do you feel your socks were just blown off? Ain't that the coolest damn thing you've seen all day?!

DREAM WHEEL: A name for the Iskenderian Ratio Computer. Accurately converts MPH to RPM, or RPM to MPH . . . Set gear ratio desired opposite tire diameter, and read MPH opposite engine RPM. The dream wheel resembles a circular slide rule.

Thanks to Newt and Tris for letting me share this with you.