Abstract: A slidable disk holder extends from a box structure a sufficient distance to permit dispersement of the disks. Means for simultaneous dispersement of all of the disk holders fit between each envelope-like disk holder. In an interconnecting tabular embodiment, tabs cut from the sides of each envelope-like holder connect each holder to an adjacent holder at a front end. Envelope extension surfaces interconnect inner ends of the envelopes slightly distant from the inner end of each envelope. The disks may be fanned out manually or, with pretensioned or spring actuated living hinges, the disks may fan out automatically upon release of a panel and notch locked into a base plate of the slidable disk holder. In another embodiment simultaneous dispersement is accomplished by a mechanically pivoting arm with a protrusion between each adjacent pair of envelope-like disk holders. Vertical or horizontal fanning may take place using living hinge connections to a slidable base plate.

Abstract: Pyroelectric detectors are mounted on a substrate having a plurality of wax-filled cavities. The wax is then dissolved to provide a low thermal loss mounting structure for the detectors.

Abstract: A rain water run-off disperser comprising mounting means, and multiple fixed deflecting surfaces spaced below a roof edge of a building in the path of water falling therefrom and preferably inclined downwardly and outwardly from said building, said deflecting surfaces deflecting water away from said building and breaking up the same into a relatively fine and dispersed shower of drops.