Photography by Infrared: Its Principles and Applications

By Walter Clark | Go to book overview

NOTE ON CHARACTERISTICS OF LAMPS OF ENGLISH MANUFACTURE

The data in this chapter relating to the energy characteristics of incandescent tungsten-filament electric lamps, carbon arcs, and mercury-discharge lamps apply specifically to products of American manufacture. In the United States general lighting service lamps are usually operated at 115 volts. In England the lamps are mostly designed for 200-260-volt supplies. For tungsten- filament lamps of English manufacture, the relative spectral dis­tribution can be taken, according to the value of the luminous efficiency of the lamp, from the data given in this chapter; the actual magnitude of the energy values will depend on the wattage of the lamp.

For carbon arcs and mercury-discharge lamps the data given in respect of the infrared radiation will apply generally in the case of sources of similar type and dimensions, provided the electrical running conditions are the same.*


BIBLIOGRAPHY

1. ABBOT C. G., The Sun, 2d ed., Appleton, New York, 1929. "Solar Radiation," Smithsonian Inst. Pub. 1932, 1933.

2. ABBOT C. G., and ALDRICH L. B., "Standard Scale of Solar Radiation," Smithsonian Inst. Pub.3288, 1934.

3. BARNES B. T., and FORSYTHE W. E., "Spectral Radiant Intensities of Some Tungsten-Filament Incandescent Lamps," J. Optical Soc. Am., 1936, 26, 313-15.

4. "Characteristics of Some New Mercury Lamps," J. Optical Soc. Am., 1937, 27, 83-6.

5. BARNES P, B., and BONNER L. G., "Filters for the Infrared," J. Optical Soc. Am., 1936, 26, 428-33.

6. BIGELOW F. H., A Treatise on the Sun's Radiation and Other Solar Phenomena, Wiley, New York, 1918.

7. BOWDITCH F. T., and DOWNES A. C., "The Photographic Effectiveness of Carbon Arc Studio Light Sources," J. Soc. Motion Picture Engrs., 1935, 25, 375-82.

8. "The Radiant Energy Delivered on Motion Picture Sets from Carbon Arc Studio Light Sources," ibid., 383-8.

9. BRACKETT F. S., "Measurement and Application of Visible and Near- Visible Radiation," ch. IV, in DUGGAR B. M., Biological Effect of Radiation, McGraw-Hill, New York and London, 1936, 123-209.

____________________
*
The author is indebted to C. C. Paterson, director of the research laboratories of the General Electric Co., Ltd., for this statement.

-174-

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