Abstract: A system for providing interior lighting for a building from a natural exterior source including reflectors adapted to reflect the light into a light unit from which the light may be diffused into the building. A sensor keeps the principal reflector aligned with a light source, ordinarily the sun, and side reflectors assure that the sunlight from sunrise to sunset is properly directed into the building. The system is useful, to a lesser extent, for heat as well as light.

Abstract: A device for cleaning blockages of a pneumatic tube for carrying seeds or similar particulate matter comprising a sensing device adapted to sense the blockage, a gate in the tube adapted to be opened in response to the sensor and a pneumatic device to blow the seed or other matter out of the tube. A time delay relay may be used to prevent unwarranted recycling of the gate opening and pneumatic devices.

Abstract: A device for planting of agricultural seeds extremely rapidly and particularly adaptable to airborne planting including a tank-like device for holding seeds and for containing compressed air. Various types of devices are provided to align the seeds and insert them into a movable nozzle from which the compressed air shoots the seed into the ground.

Abstract: A device for planting of agricultural seeds extremely rapidly and particularly adaptable to airborne planting including a tank for holding seeds and for containing compressed air. Mechanism is provided to align the seeds and insert them into a movable nozzle from which the compressed air shoots the seed into the ground.