In 1885, Nikolay Benardos and StanisBaw Olszewski developed carbon arc welding, obtaining American patents from 1887 showing a rudimentary electrode holder.
32.
Carbon arc lamps were started by making contact between two carbon electrodes, which were then separated to within a narrow gap.
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Therefore, O'Brien, as a physicist on staff, developed a carbon arcs with cored carbons that very closely matched the solar spectrum.
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Unlike single-carbon arc welding, in "'twin-carbon arc welding "'the arc is maintained between two carbon electrodes held in a special holder.
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The sidewalls have the original gold embossed paneling and the projectors, which were added around 1943, are of the carbon arc variety.
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In the same year an iron heated by a carbon arc was introduced in France, but was too dangerous to be successful.
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These larger ones use a carbon arc lamp as their light source, with a diameter of 20 inches ( 50 cm ).
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Secondly, although the carbon arc lamp was bright, and relatively economical for the illumination produced, individual lamps were expensive and complicated, although powerful.
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In the 1980s and as carbon arc lamps fell into decreasing use, the spotlight began to employ a high-intensity xenon lamp as its light source.
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Xenon, mercury, metal halide or carbon arc lamps have to be used with a careful elimination of shorter wavelenghs usually by adding a borosilicate filter.
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