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Investigations on the Reflection and Transmission Characteristics of Photographic Plates

Citation

McRae, Daniel Brent (1930) Investigations on the Reflection and Transmission Characteristics of Photographic Plates. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/994m-ar08. https://resolver.caltech.edu/CaltechTHESIS:08272024-185548335

Abstract

A method is described for measuring the reflection and transmission of light by a photographic plate under conditions similar to those met in the ordinary use of the plate. The essential features of the work are the use of photographic methods of measurement and the development of a null method of working which eliminates from the discussion the characteristic curve of the plate the degree of development or contrast, and which requires as a final step only a single measurement of the transmission of an optical wedge at some chosen point.

A complete series of measurements was carried thru on several boxes of Eastman 40 plates, all of the same emulsion number. The measurements were made using white, blue, green and red light.

It was found that for blue light the plate reflected 25%, transmitted 9%, and absorbed 66%. The reflection and transmission losses increased rapidly with increasing wavelength. The effect of exposure time on reflection and transmission was investigated and no change was found in these factors over considerably greater lengths of time than any of the exposures used in this work.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:(Chemistry)
Degree Grantor:California Institute of Technology
Division:Chemistry and Chemical Engineering
Major Option:Chemistry
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Unknown, Unknown
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1930
Record Number:CaltechTHESIS:08272024-185548335
Persistent URL:https://resolver.caltech.edu/CaltechTHESIS:08272024-185548335
DOI:10.7907/994m-ar08
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:16676
Collection:CaltechTHESIS
Deposited By: Benjamin Perez
Deposited On:29 Aug 2024 21:12
Last Modified:29 Aug 2024 21:13

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