Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978natur.276..591m&link_type=abstract
Nature, vol. 276, Dec. 7, 1978, p. 591-593.
Astronomy and Astrophysics
Astronomy
74
Astronomical Photography, Imaging Techniques, Photographic Plates, Supernova Remnants, Amplification, Densitometers, Photographic Emulsions, Protective Coatings
Scientific paper
The paper describes a method for making visible extremely faint images on astronomical plates. The procedure, which avoids the imaging of fog grains, can be applied to photographic images that are not apparent on visual inspection and which can not be detected by conventional macrodensitometry. Faint images tend to be located in the uppermost layers of the developed emulsion while grains due to chemical fog are distributed at random throughout the total thickness of the emulsion coating. Spectroscopic plates do not have a transparent protective supercoat to prevent abrasion, and a diffuse-light vacuum-contact printer is used to make contact copies of the original plates; only the upper layer image is recorded.
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