Abstract: The invention provides a solar collector comprising a trough-like reflector for receiving solar rays and for concentrating the rays in a direction generally transverse to the length of the reflector between its ends. Concentrator means is provided for receiving the concentrated rays from the trough-like reflector and for concentrating the rays in one or more of a direction generally along said length and a direction generally transverse to said length.

Abstract: A snow barrier for a roof having modular components including brackets that slidingly interfit into rails that extend up and down the slope of the roof. The brackets may be rotated to provide fences of differing heights. A corrugated fence is easily installed by reason of a self-positioning, hooked, upper flange formed along the upper edge of the corrugated fence. The corrugated fence may be modular, being built-up of smaller, corrugated strips. Pads may replace the rails in supporting the brackets or the brackets may be fastened directly to the roof.

Abstract: The present invention is directed to a product irradiator comprising a loading-unloading area and an irradiation chamber, a continuous track having a level-changing portion, wherein the continuous track enters and exits the irradiation chamber from the loading-unloading area. The continuous track is comprised of at least one rail and of at least two levels to about 8 levels. An irradiation source, for example cobalt 60, and which is preferably horizontal in orientation, is located within the irradiation chamber. The product irradiator comprises a substantially horizontal carrier, which is engaged to the continuous track, and at least one drive mechanism capable of moving the carrier along the continuous track.