Abstract: A control system for an industrial dryer used to remove a flammable solvent or vapors from a traveling web of material or the dryer. The dryer consists of a chamber which is preferably a large metallic cylinder through which the web of material moves longitudinally. Seals in the metallic cylinder at the points of entry and exit of the traveling web permit the control system to maintain the desired environment under controlled pressure within the metallic cylinder. The web of material travels successively through one or more zones within the metallic cylinder. At each zone, the web of material is exposed to a pressurized atmosphere which may be at increasingly higher temperatures. The solvent is recovered from the pressurized atmosphere by rapid cooling, membrane separation or absorption. Sensors within each zone measure the oxygen content of the pressurized atmosphere. If the oxygen content exceeds a given threshold, pressurized nitrogen or other inert gas is added.

Abstract: The invention covers a mechanism for turning a horizontal axis rotor windmill into the direction of the wind, either under the instruction of a small pilot vane, or automatically without the use of such vane. This is accomplished by cyclically controlling the pitch of the rotor blades during revolution whereby to decrease the gyro forces on the rotor when yawing, as well as to take advantage of the force of the wind on the blade to assist turning the axis into the wind. The mechanism of the present invention automatically and cyclically alters the pitch of the blades as the yaw angle of the wind changes so as to present a cyclically different angle of attack between the blades and the wind, thus utilizing the force of the wind to cause the turning of the axis of the rotor into the wind.