Bridge (nautical)
The bridge of a ship is the room or platform from which the ship can be commanded. When a ship is underway the bridge is manned by an OOW (officer of the watch) aided usually by an AB (able seaman) acting as lookout. During critical maneuvers the captain will be on the bridge supported, perhaps, by an OOW as an extra set of hands, an AB on the wheel and sometimes a pilot if required.
Wheelhouses are the small enclosed parts of a bridge which historically held the ship's wheel. Today, ship's bridges do not have a separate wheelhouse; the term wheelhouse or pilothouse is used nowadays to refer to the smaller bridges of small vessels, such as tugs.
Evolution
Traditionally, sailing ships were commanded from the quarterdeck, aft of the mainmast. With the arrival of paddle steamers, engineers required a platform from which they could inspect the paddle wheels and where the captain's view would not be obstructed by the paddle houses. A raised walkway, literally a bridge, connecting the paddle houses was therefore provided. When the screw propeller superseded the paddle wheel, the bridge was retained.
Bridge (1949 film)
Bridge (simplified Chinese: 桥; traditional Chinese: 橋; pinyin: Qiáo) (also known as The Bridge) is a 1949 Chinese war film made shortly after the Communist revolution in China; as such, it is considered the first film completed after the founding of the People's Republic of China. As a film, Bridge set many of the themes that would dominate the Socialist cinema of post-1949 China, including the glorification of the worker and the conversion of the intellectual to Communism.
Plot
During the Chinese Civil War, a railroad factory is commissioned by the Communist army to repair a bridge. Led by a skeptical engineer who does not believe the bridge can be completed in time, the factory workers lack enthusiasm and morale. The project is galvanized, however, by the work of Liang Ruisheng (Wang Jiayi), who inspires his fellow workers to complete the project for the war effort. In the process, even the engineer is converted.
References
References
Bicyclic molecule
A bicyclic molecule is a molecule that features just two rings. Bicyclic molecules occur widely in organic and inorganic compounds. Among organic compounds, the two rings can be fully carbocyclic (all atoms in each ring all carbons), or one or both can be heterocyclic (at least one atom in the rings not a carbon atom). Moreover, the two rings can both be aliphatic, or can be aromatic, or a combination of aliphatic and aromatic (cf. decalins and naphthalenes, norbornanes and cyclophanes, aliphatic spiro compounds and spiroaromatics, and biphenyl and cyclohexylbenzene, as aromatic and mixed examples).
Joining of the rings can occur in four ways:
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