Abstract: A system for collecting and purifying polluted air over a large geographic area where surface level water channels are used for rainfall drainage. The water channels are covered to render them air passages as well, and air jet engines draw the polluted air from the areas to a purifying station where debris is separated and the polluted air is passed to purifying units before being discharged from the station. The water channels may be covered to provide lineal parks or roadways for light traffic. Also, sewage passages may be incorporated in the system to provide greater area coverage and reduce noxious fumes.

Abstract: A solar energy collector which includes a sun ray window adjacent an array of flat reflector panels each positioned to direct solar energy to a major collector unit on each side of the unit utilizing a secondary reflector plate. A heliotropic mount is provided for the reflector panels. A multiple blind assembly is optionally positioned in the solar window carrying photovoltaic units to convert solar energy and limit the energy selectively to the major collector unit when maximum storage capacity is reached.

Abstract: A method of installing an electromagnetic sensor loop in a multiple lane highway for monitoring vehicle traffic which includes the steps of placing a test loop at a desired location in a highway traffic lane approximately centrally thereof and varying the lateral dimension of the test loop until the field strength generated thereby at the lane edge is such that the loop will reliably distinguish between a vehicle in the lane in question and a vehicle in the next adjacent lane.