Automatic vehicle-speed adjusting device

A device for controlling the speed of a vehicle as the latter negotiates a curve comprising a U-shaped tube having two legs joined to a cross over, said U-shaped tube being disposed in said vehicle with its two legs substantially vertically disposed and with the general plane of the U-shaped tube being disposed generally transversely of the longitudinal axis of the vehicle, terminal elements secured in an air-tight manner in the legs of said U-shaped tube, mercury disposed in said U-shaped tube such as to normally contact said terminal elements when the vehicle is moving in a straight path, said terminal elements have vertical internal passages with the lower ends of said internal passages leading to said mercury in said U-shaped tube, said terminal elements have upper closed ends, and enlarged air-chambers in said terminal elements leading from the upper ends of said internal passages, said mercury being movable in said U-shaped tube so as to break contact with one of said terminal elements when the vehicle negotiates a curve and subjects the mercury to centrifugal force.