Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

An Experimental Study of Latent-Image Formation by Means of Interrupted and Herschel Exposures at Low Temperature
Measurements of Reciprocity Law Failure at Low Temperature

Not Accessible

Your library or personal account may give you access

Abstract

The present paper contains results of experiments carried out to test the theory of latent-image formation recently proposed by Gurney and Mott. In their theory, these authors have introduced the concept of electrolytic transport of Ag+ ions to account for the nucleation of latent image Ag about the sensitivity specks preexistent on the surface of the grains. The Ag+ ions are supposed to diffuse to the specks under the attraction of electrons trapped there during the exposure to light. The first experiment consisted of a series of intermittent exposures made at liquid air temperature with warm-up periods between flashes. The results indicate that something vital to the photographic process takes place during the warm-up period between exposures. The second experiment consisted of a series of Herschel exposures made under the following temperature conditions: (a) White-light exposure 20°C, Herschel exposure 20°C; (b) white-light exposure 20°C, Herschel exposure −186°C; (c) white-light exposure −186°C, Herschel exposure 20°C; (d) white-light and Herschel exposures both at −186°C; (e) case (d) repeated with warm-up period between the exposures. The results obtained are radically different under the different conditions. Finally, results are presented on reciprocity measurements at temperatures 20°C, −78°C, and −186°C. These results show that the low-intensity reciprocity law failure has disappeared at −78°C and that the high intensity failure has practically disappeared at −186°C. All of the foregoing results are shown to have ready interpretation on the Gurney-Mott picture of latent-image formation.

© 1938 Optical Society of America

Full Article  |  PDF Article
More Like This
The Failure of the Photographic Reciprocity Law at Low Intensity*

J. H. Webb and C. H. Evans
J. Opt. Soc. Am. 28(11) 431-436 (1938)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (14)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Tables (2)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (1)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved