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Spectrophotometric analysis of the paint used in these tests. This paint has a marked drop in reflecting power in the blue and violet regions, but to the eye it seems to be pure white.
An integrating sphere equipped for testing a sodium arc. The dark incandescent lamp over the sodium arc has an amber bulb and gives light that visually matches the arc in color for routine calibration. The amount of equipment required for this work adds to the difficulty of getting accurate data.
Diagrammatical sketches of the sphere in partially opened and closed positions. The opened sphere permits light to escape through a wedge-shaped opening into the black photometer room.
Diagrammatic sketch of the area of the sphere opening. The height to the line
Sensitivity of the sphere to variations in the coefficient
Sensitivity of the sphere to variations in the factor
Brightness of the open sphere
Sensitivity of the ratio
Relative brightness of the sphere. The computed results by the open-and-shut method were checked by an independent method of somewhat lower inherent accuracy. Paint
Line spectra of various mercury arcs at four wave-lengths. The families of mercury lines for each type of lamp are connected by lines to bring out more clearly the wide variations in color of this type of arc. Solid circles—uviarc at low pressure; open circles—uviarc at high pressure (arc only); broken line—low pressure; triangles—
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