Photography by Infrared: Its Principles and Applications

By Walter Clark | Go to book overview
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the manner described. A contact copy is made by printing onto a high-contrast film or plate--a contrast lantern plate is often satisfactory--and the positive so obtained is further printed onto a second sheet of the same material. Usually, the resulting negative will have adequate contrast, but if it does not the process may be repeated. This method of multiple printing has one disadvantage in that it tends to eliminate all gradation in the copy, resulting in hard dense lines with sharp edges. This is of no consequence in copying written or printed matter when it is merely desired to read the original material. Developers giving very high contrasts are preferred.


1. AUERBACH E., "The Case of the Hidden Woodcut," Photo Technique, 1940, 1, Sept., 58-62.

2. BEARDSLEY N. F., "The Photography of Altered and Faded Manuscripts," Library J., 1936, 61, 96-9.

3. BENDIKSON L., "Phototechnical Problems: Some Results Obtained at the Huntington Library," Library J., 1932, 57, 789-94.

4. "Charred Documents," Library J., 1933, 58, 243-4.

5. "The Restoration of Obliterated Passages and of Secret Writing in Diplomatic Missives," Franco-Am. Rev., 1937, 1, no. 3, 19.

6. BEDIKSON L., and HASELDEN R. B., "The Detection of Manuscript Forgeries," Library J., 1934, 59, 442.

7. BITTINGER C., "Combining Reflected and Transmitted Light-Waves of Varying Lengths to Produce Subjective Changes in Scenic Effects," U. S. pat. 1,342,247, issued June 1, 1920.

8. BLOCH O., "Developments in Infra-Red Photography," Phot. J., 1932, 72, 334-40.

9. "Recent Developments in Infra-Red Photography," J. Roy. Soc. Arts, 1933, 81, 262-75; Chem. & Ind., 1933, 11, 829-37.

10. "Infra-Red Photography and Illegible MSS," Discovery, 1934, May, 138-9.

11. "Applications of Photography to Scientific and Technical Problems," J. Roy. Soc. Arts, 1937, 85, 651-72.

12. BRADLEY C. W., "Photography as Applied to Textile Research," J. Soc. Dyers Colourists, 1945, 61, 61-4.

13. CUNLIFFE P. W., "Application of Infra-Red Photography to Textiles," J. Soc. Dyers Colourists, 1933, 49, 73-6.

14. "Photography and Wool Research," Phot. J., 1935, 75, 439-44.

15. DANCKWORTT P. W., "Infrarotphotographie von schwarzen Farbstoffen," Z. angew. Phot., 1939, 1, 48-50.

16. DUNLOP J. R., "Photographic Work of the FBI," J. Phot. Soc. Am. 1945, 11, 285-91.


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Photography by Infrared: Its Principles and Applications
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