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Bulletin of the Seismological Society of America; October 1956; v. 46; no. 4; p. 331-332
© 1956 Seismological Society of America
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An automatic spot brightener*

J. CL. DE BREMAECKER and JEAN MICHEL

INSTITUT POUR LA RECHERCHE SCIENTIFIQUE EN AFRIQUE CENTRALE (I.R.S.A.C.), CENTRE DE RECHERCHES SCIENTIFIQUES DU KIVU,, LWIRO, BUKAVU, CONGO BELGE

Abstract

The automatic spot brightener consists of an auxiliary beam directed on one of the moving mirrors of the instruments, and from there on a photocell. Interruption of the light on the cell short-circuits a resistance and brightens the spots.

Footnotes

* Manuscript received for publication June 10, 1955.




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L. BOURGEOIS and M. BUIST
An automatic spot-brightness control for photographic recorders
Bulletin of the Seismological Society of America, August 1, 1967; 57(4): 817 - 820.
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