Abstract: A fuel additive for use in the treatment of diesel fuels to reduce polluting emissions during the combustion of such fuels wherein the additive composition is formulated to contain mineral seal oil, mineral spirits, a glycol alkyl ether and at least one alkyl aromatic ethoxylated surfactant. It has been found that the fuel additive composition of the invention can be blended with such fuels to dramatically reduce emissions during the combustion of such fuels.

Abstract: A system for purifying a liquid including a reactor and a clarifier with the clarifier arranged at an elevated position relative to the reactor so that residue from the clarifier can be returned to the reactor hydrostatically. Liquid in the reactor is aerated using an agitating means with the agitating means also used to transfer liquid from the reactor to the clarifier. The liquid is fed to the clarifier at a constant, controlled rate.

Abstract: A joystick actuator for controlling the positioning of objects, for instance, displays on CRTs, having a pivotally mounted control stick operatively engaging and driving a pair of optical-mask members. The optical-mask members are retained for rectilinear sliding motion relative to fixed mounted opto-switches and include spaced fins positioned to interrupt light communication within respective opto-switches. Positioning of the opto-switches and spacing of the mask fins are selected to provide successive unblocking of the interrupted light communication as the control column is displaced from neutral thereby encoding both the direction and magnitude of stick deflection.