Street lighting

The color of the emitted light depends on what type of gas is present. For example, sodium atoms glow with a yellow light (as in the familiar yellow street lights), and neon glow with a dark red light (as in the familiar neon lights). 

Street light globes, centrifuge bottles, high-temperature lenses, hot dish handles... 

The new dynamos made arc lighting economically feasible, especially for street lights. Initial installations were made in Paris in 1877, London at the end of 1878, San Francisco in 1879, and New York in 1880. The other principal commercial application in those early years was for electroplating. 

Italian-American physicist Nikola Tesla invents a motor that produces alternating current. This discovery changes the way electricity is transmitted over long distances. The first commercial, long-distance transmission of electricity takes place when a direct-current line provides power from Willamette Falls for street lights in Portland, Oregon. 

Polycarbonates are used in a variety of articles such as laboratory safety shields, street light globes, and safety helmets. The maximum usage temperature for polycarbonate objects is 125°C. 

Aluminium spraying of steel street-lighting columns has been used since the 1950s and it is estimated that one producer alone has supplied up to 200000 such columns repainting is simpler, even on neglected columns, than on columns not metal sprayed. Aluminium spraying has been used on reflector towers used in the television link between Manchester and Edinburgh, and on similar structures. 

Soft, silvery metal, very reactive. Reacts vigorously with water and air, must be stored under paraffin oil. Used in industry as a strong reducing agent. Reacts with equally aggressive chlorine to form harmless salt known to be essential to life. As all life stemmed from the sea, all life forms require sodium ions, for example, for the conduction of the nerves and for humans to think. In humans (70 kg), 100 g of sodium can be found (as ions). Easy detection makes flames yellow. Used in yellow lamps for street lighting. Sodium ions are widespread, for example, in glass, soap, mineral water, etc. 

The electrical uses of mercury include its application as a seal to exclude air when tungsten light bulb filaments are manufactured. Fluorescent light tubes and mercury arc lamps that are used for street lighting and as germicidal lamps also contain mercury. 

The more obvious forms of public art include monuments, sculptures, fountains, murals, and gardens. But public art also takes the form of ornamental benches or street lights, decorative manhole covers, and mosaics on trash bins. Many city dwellers would be surprised (10) to discover just how much public art is really around them and how... 

Antoine Lavoisier came from wealth, and his approach to maintaining it was eminently practical. Like his German rival, Georg Stahl, Lavoisier observed fermentation processes to learn about chemical transformations. Such experiments had a mercantile application in alcoholic drinks. He analyzed mineral waters, helped develop street lighting for Paris, and tested the quality of state tobacco. Lavoisier advised the government on soil cultivation, chemical fumigation of prisons, water purification, and uniformity of... 

You and Sally are quiet as you gaze outside at the street lights. They cast shadows that spring up about you as if they are living creatures. Suddenly most of the lights go out. Others flicker like fireflies. 

The discovery of ethylene as a plant growth substance followed from the observation in Germany that leakage of gas used in street lighting was associated with the defoliation of trees. Subsequent research demonstrated the active component as ethylene, which was then implicated in the endogenous acceleration of ripening, the promotion of flowering and sex determination in addition to abscission of plant parts. 

Mercury arcs are employed in these lamps because of the spectral distribution they emit, and because mercury vapor is relatively inert. It does not attack either the glass or the electrode materials (Kirk 1982). This contributes to the long lifetimes of mercury lamps. Low pressure mercury lamps are commonly called fluorescent lamps. High pressure mercury lamps are used in industrial environments and for street lighting and floodlighting. Other applications for mercury vapor lamps include motion-picture projection, photography, and heat therapy. 

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