Abstract: The disclosure relates to an evaporative cooler construction having a frame comprising corner posts, a sump pan and a cover pan, together with pivotal access doors above and between the corner posts adapted to overlie and expose upper portions of evaporative cooler pad assemblies between the corner posts; said access doors also adapted to lock into place louver grills disposed between the corner posts and substantially flush with the outer extremeties thereof; the disclosure also relating to novel structural interconnection of the corner posts, the sump pan and the cover pan, as well as novel bayonet hinge structure connecting the access doors with the cover pan of the evaporative cooler construction.

Abstract: The disclosure relates to an insulator means for electrostatic precipitators wherein a column is centrally supported on a base structure above which a plurality of concentric generally cylindrical and circular in cross section discharge electrodes are electrically coupled to and suspended from radially disposed arms supported on said column; said discharge electrodes being adapted to operate between respectively circular in cross section collector electrodes; said arms being supported on said column by means of a hollow insulator having a bore therethrough and a high voltage conductor extends upwardly through said bore of said hollow insulator; said conductor being electrically coupled with said arms; and grease like dielectric material packed in said bore of said insulator and surrounding said conductor therein; and a sheath surrounding said conductor and disposed between said conductor and said grease like dielectric material; the disclosure also relating to means for mechanically coupling said insulator to

Abstract: The disclosure relates to an electrostatically rechargeable device comprising a body having a rubbing end adapted to be rubbed against fabric or other material for electrostatically charging the device. The device is preferably made of teflon and may utilize a metal cap thereon with "Teflon" (Polytetrafluoroethylene) on the outer side thereof, and the device is provided with a series of lands and grooves around its intermediate portion to extend the surface dimension thereof from the chargeable end to the opposite end to thereby inhibit the leakage of electrostatic charges from the chargeable end thereof.