There is disclosed a reflector structure that is highly visible both in daylight and at night, the structure including a body of transparent material having a front face and a rear face, the rear face including a continuous support surface having therein a plurality of recesses each defining a cell surrounded by a support wall, a plurality of retrodirective reflector elements disposed in the recesses for reflecting light falling upon the front face back toward the source thereof to render the re...

Structure for an incinerator hearth is disclosed where the drop hole area of the hearth can be constructed entirely of standard shape, and thus readily available, fire brick rather than the special shapes previously necessary.

Device for adding secondary air to a converter structure including a converter housing with inlet and outlet structures attached to opposite ends thereof. A pair of catalyst containing beds are supported within the housing in spaced relationship. The improved device for introducing secondary air in the space between the spaced catalyst containing beds includes structure for forming a restricted throat between the spaced catalyst containing beds and structure forming an annular zone between the s...

An improved roof structure using flexible sheets of waterproof roofing material such as a felt backed polyvinyl chloride. An inverted generally V-shaped channel joins adjacent edges of the sheets of material. The channels have sides and an apex extending above the normal maximum water level on the roof structure during heavy rains. The adjacent edges of the material are bonded to the opposite sides of the channel and are further sealed by overlapping and bonding together or by a bonding to the i...

A construction panel is provided for use with other such panels to build up siding on a building structure. The panel includes similar marginal portions each of which defines a channel and an adjacent tongue which extends outwardly from the channel. The shape of the channel is such that it can receive the tongue of an adjacent panel for assembling panels to build up siding.

An underwater gas/liquid reservoir 1, particularly designed to be used as a ballast/buoyancy tank in an offshore drilling platform, has a pressurized supply duct 2 for introducing gas into the reservoir to control the liquid level therein. The gas supply duct has two openings 8, 11, one near the bottom of the reservoir and the other near the top. A movable straddle packer 14 is disposed in the gas supply duct for selectively closing the bottom opening 8 so that gas is allowed to flow only throug...

Relates to anodes for electrolytic cells, for the electrolysis of brine solutions, having primary lead-in means of high conducting capacity (copper) for supplying anodic current to the cell from outside the cell and connected to a current supply source, primary conducting means of lower conducting capacity (titanium, or tantalum or alloys thereof) inside the cell, secondary conducting means of lower conducting capacity (titanium, or tantalum or alloys thereof) inside the cell for conducting curr...

A greenhouse structure composed of at least five intersected ring members providing a dome-shaped configuration over which a flexible cover is fitted. A particular manner of ring member intersection is employed to make the structure self-supporting. The flexible cover is provided with an arcuate closeable opening for access into the structure.

A one piece paperboard internal partition structure including a longitudinal wall and at least one transverse wall foldably joined thereto.

A frame extending around an opening in a vehicle roof has a resilient molding adapted to support the perimeter of a curved glass panel to close off the opening. A pair of bayonets projecting in spaced relation to the underside of the forward edge of the panel mates with a recessed member carried by the frame when the panel is inclined with respect to the roof to act as a pivotable hinge allowing motion of the panel between a closed position and that inclined position. A two-part fastener for the...