Abstract: Enclosures for deep ocean or other high exterior pressure environment including a dome window with an angular measurement of between 164 and 178 degrees, a structure housing, a dome support ring, and a compliance material positioned between the dome support ring and housing are disclosed.

Abstract: Lighting apparatus for high pressure underwater use are disclosed. In one embodiment the lighting apparatus comprises a housing for withstanding ambient exterior pressure at a depth of approximately 500 feet or more, a transparent pressure bearing window positioned at a forward end of the housing, and a multilayered stack for bearing substantially all of the loading applied to the transparent pressure bearing window at a depth of approximately 500 feet or more disposed in the housing behind the transparent pressure bearing window is disclosed.

Abstract: A dry chemical dispensing system includes one or more chemical dispenser, a fluid supply conduit, and a fluid pressure source. The fluid supply conduit is adapted to couple to a fluid source, and supplies fluid from the source to dry chemicals installed in the chemical dispensers. The fluid supplied to the dry chemicals dissolves a portion into solution. The fluid pressure source maintains a substantially constant fluid pressure magnitude in the fluid supply conduit. Thus, any variations in pressure of the fluid source do not affect the pressure of the fluid supplied to the chemical dispensers. As a result, dissolved chemical concentration is substantially controlled.