Sådan virker gearkassen

Videoen er fra 1936 og forklarer, hvordan en gearkasse med tre fremadgående gear og et bakgear virker. 

"The transmission in the modern motorcar -- the mechanism that makes it possible to have three forward speeds and a reverse -- is a series of levers, levers that spin. Producer: Handy (Jam) Organization Sponsor: Chevrolet Division, General Motors Corporation."