Abstract: An arrangement for controlling the location of sprayed viscous material, in which a spray head forms a stream of the viscous material, and has at least three orifices for forming air streams. The orifices are disposed at substantially equal angles around the material stream. Air pressure is applied to the orifices, and this air pressure is controlled by a valve. The valve is adjusted proportional to the position of a plate that is positioned by a control. The spray head has at least three additional orifices that form second air streams placed symmetrically about the viscous material streams. These second air streams are directed to impinge upon the viscous material after the latter is deposited on a surface. An additional valve controls air pressure applied to the additional orifices, and this additional valve is adjusted proportional to the position of the plate.

Abstract: A closed-loop height control for the header of a combine harvester permits adjustment of height setpoint and deadband from the operator's platform without stopping the combine. A variable capacitance is rotated in accordance with minimum clearance between header and ground to generate a continuous electrical header height signal which is compared to a setpoint signal indicative of desired header height to derive a height error signal whose value is at a null level when actual header height is equal to desired height indicated by the setpoint signal and which deviates in both magnitude and direction from the null level as a function of the variation between actual header height and setpoint height. Raise and lower command signals are derived in response to a predetermined deviation of the height error signal in opposite directions respectively from the null level by first and second Schmitt trigger circuits having switching levels which respectively are greater than and less than the null value.

Abstract: A grain loss monitor for a combine harvester derives a grain loss rate signal in accordance with the number of grains impinging on a transducer and a ground speed signal proportional to the ground speed of the combine and divides the former by the latter to derive an analog of grain loss per unit area which is independent of time.