pressure-watertight
51photography, technology of — Introduction equipment, techniques, and processes used in the production of photographs. The most widely used photographic process is the black and white negative–positive system (Figure 1 >). In the camera the lens projects an image of… …
52Derfflinger-class battlecruiser — SMS Derfflinger Class overview Name: Derfflinger Operators …
53BAP Pacocha (SS-48) — was a submarine of the Marina de Guerra Peruana (Peruvian Navy) named for the 1877 Battle of Pacocha, in which the Peruvian ironclad Huascar clashed with the Royal Navy. Formerly USS|Atule|SS 403, a Balao class submarine with a GUPPY IA upgrade,… …
54Shower — A shower (also called shower bath) is a booth for washing, usually in a bathroom, having an overhead nozzle that sprays water down on the body. A full bathroom may include a shower stall, whereas a half bathroom will not. History The practice of… …
55Diving mask — A diving mask showing the retaining strap A diving mask is an item of diving equipment that allows scuba divers, free divers, and snorkelers to see clearly underwater.[1] When the human eye is in direct contact with w …
56Nortraship — v · …
57Cross-linked polyethylene — PEX redirects here. For other uses, see Pex (disambiguation). Cross linked polyethylene, commonly abbreviated PEX or XLPE, is a form of polyethylene with cross links. It is formed into tubing, and is used predominantly in hydronic radiant heating …
58Alfa class submarine — The Soviet Union/Russian Navy Project 705 ( Лира / Lyra ) was a submarine class of hunter/killer nuclear powered vessels (abbreviated PLA: Podvodnaya lodka atomnaya , nuclear hunter/killer submarine). The class is also known by the NATO reporting …
59Standard diving dress — The standard diving dress was used from its invention in 1837 until replaced by the rise of scuba and other modern diving outfits in the 1960s. In this 1873 illustration from the Illustrated London News, we see the basic features of it: A helmet …
60Russian submarine Kursk explosion — On August 12, 2000, the Russian Oscar II class submarine, Kursk sank in the Barents Sea. The generally accepted theory is that a leak of hydrogen peroxide in the forward torpedo room led to the detonation of a torpedo warhead, which in turn… …
