Abstract: An aircraft traffic pattern computer employing a slotted frame having a window surrounded by a compass rose which is movable in relation to the frame about a pivot point, the slotted frame being adapted for holding a placard having a pair of surfaces upon which various aircraft movement patterns are shown about a reference point and a reference line such that alignment of the reference point with the center of the compass rose and alignment of the reference line with the compass rose proper provides at least one selected course heading for an aircraft.

Abstract: A device for the recovery of dry chemicals found in powdered form for fire extinguishers utilizing a container having first and second openings. A conduit permits the powder material to enter the container through the first opening. Another conduit permits the material to exit the second opening into the fire extinguisher. Lumping is prevented by the use of screens and the like within the container. As the material flows through the second opening of the container, air in the fire extinguisher is conveyed through the first opening in the container.