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In this case, shown in part D of the diagram, there is no dry access between the chamber and the sea surface, and the moon pool is the only entry or exit to the chamber. Submerged chambers provide dry areas for work and rest without the need to ascend to the surface. [ 6 ]
The glass-bottom boat was invented in 1878 by two men, Hullam Jones and Philip Morrell, in Marion County, Florida.Jones outfitted a dugout canoe with a glass viewing box at the bottom, which allowed tourists to view the clear waters of Silver Springs, Florida. [2]
Ancient boat building methods can be categorized as one of hide, log, sewn, lashed-plank, clinker (and reverse-clinker), shell-first, and frame-first. While the frame-first technique dominates the modern ship construction industry , the ancients relied primarily on the other techniques to build their watercraft.
Jewish refugees look out through a porthole of a ship while docked in the port of Haifa, c. 1950–1959. A porthole, sometimes called bull's-eye window or bull's-eye, [1] is a generally circular window used on the hull of ships to admit light and air.
A cathedral hull, seen from blow, with a simple platform for the rest of the boat. A cathedral hull is a hull shape used in modern boats, usually power-driven. It has sponsons which extend almost as far forward as the main hull. The airspace between the hulls may be very small or nonexistent.
HMT Aquitania wearing dazzle camouflage. Patterned ship camouflage was pioneered in Britain. Early in the First World War, the zoologist John Graham Kerr advised Winston Churchill to use disruptive camouflage to break up ships' outlines, and countershading to make them appear less solid, [14] following the American artist Abbott Handerson Thayer's beliefs.
A-frame derrick. An A-frame derrick is one in which the boom is hinged from a cross member between the bottom ends of two upright members spread apart at the lower ends and joined at the top; the boom point secured to the junction of the side members, and the side members are braced or guyed from this junction point.
Lights can simply be turned off or light can sometimes be minimized by tarring the windows of large public structures. In World War II, a dark blackout curtain was used to keep the light inside. Tarring the windows can mean a semi-permanent blackout status. During the 1940s and 1950s, cities such as Detroit would
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