"My invention relates to what are known as "self-propelling torpedoes" in which the torpedo is driven by a propeller actuated by a motor and an immersion device by which the torpedo is caused to reach and maintain itself at a predetermined depth in the water after launching. My invention related more particularly to depth-regulating mechanism by which the torpedo is caused to reach and maintain a predetermined depth in the water by automatically varying the action of its immersion-rudder to the pendulum-immobilizing connection between the speed-regulator and immersion device, whereby the latter is automatically locked and released by the former, and to various details of the same, hereinafter more fully set forth."