>>211734129>>211734365>>211734414Automatic transmission with hydraulic fluid
An automatic vehicle transmission is a type of motor vehicle transmission that automatically changes gear while the vehicle is moving. Thus, the driver is free of shifting gears manually.
Alfred Horner Munro of Regina invented the first automatic transmission in 1921, but as he was a steam engineer, his device used compressed air, and it therefore lacked power so it never found commercial application. In 1932 José Braz Araripe and Fernando Lehly Lemos then developed the first automatic transmission with hydraulic fluid.
They subsequently sold the prototype and plans to General Motors who introduced them to their 1940 model Oldsmobile as “hydra-matic”. The device was then incorporated to GM-built tanks, and marketed thereafter as “battle-tested”.