Abstract: Rotary internal combustion engine of axial sliding vane type has sinusoidal shaped side walls with compensation of the mass forces allowing nearly friction-free and high speed operation with sufficient compression ratio. High power output is believed to make the invention comparable to the well-known Wankel engine.The various designs of the rotary machines can also be used as fluid pumps or fluid-operated motors.

Abstract: A hammer mill has a grinding chamber and means therein sufficient enough to grind grain in one pass through the chamber and throw it directly if desired to a remote point, together with means for adjusting the grinding chamber intake for grain and especially corncobs and a corncob intake metering attachment. The mill hammers have raked back leading edges to accelerate feed particles to a speed less than that of the hammers, to multiply the number of impacts on the grain. The smoothness of the mill wall can be varied by turning channels located in a recess in the wall so that either the web or the flange edges of the channels face inwardly toward the hammers.

Abstract: An oil burner consists of an outer jacket surrounded and spaced from an inner burner tube to provide a surrounding counterflow chamber. Jacket and tube project horizontally inwards from the surrounding combustion chamber wall. Counterflow chamber is substantially closed at both ends. Tube projects inwardly beyond counterflow chamber and terminates in an upfacing burner head. Communication exists at opposite ends of the part of tube surrounded by counterflow chamber. At startup a tongue of flame travels through tube from an injector nozzle. Part of flame counterflows back through surrounding chamber and recirculates through tube. Another part of flame proceeds on to burner head. When parts sufficiently heated, flame in tube is caused to be extinguished and is replaced by hot clear blue flame jets from burner and a multiapertured band in tube within limits of counterflow chamber at end thereof remote from nozzle where counterflow originates.