Abstract: An automatically guided vehicle system for steering a vehicle. Optical sensing detects an image of a segment of track mounted above the path of the vehicle. Electrical signals corresponding to the position of the track are generated. A control circuit then converts these signals into movements for the steering of the vehicle.

Abstract: Pistons of one pair of double-acting cylinders are connected to opposite sides of one point of a lever, one being driven by one chemical and the other supplying the chemical to a mixing and applying gun. A second pair of pistons of a second pair of double-acting cylinders are connected to the lever at a second point on the lever, a distance from the pivot point of the lever either the same or a predetermined fraction of the distance of the first-mentioned point from the pivot point of the lever, and are driven by a second chemical and supplying the second chemical to the gun, the cylinders all being of the same diameter. Valving actuated by the lever reverses the drives of the pistons automatically. In an alternate embodiment, supplies of the chemicals to the gun may be cut off and a solvent supplied to the gun to prevent the chemicals in the gun from setting up.