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Uniformity of UKSTU Photographic Plates

Published online by Cambridge University Press:  25 April 2016

J. A. Dawe  and
N. Metcalfe
J. A. Dawe
Affiliation:
U.K. Schmidt Telescope Unit of the Royal Observatory Edinburgh, Siding Spring Observatory
N. Metcalfe
Affiliation:
Department of Astrophysics, University of Oxford
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Extract

Most plates taken with the UK Schmidt Telescope are hypersensitized before use. The technique for the hyper-sensitization of IIIa-type emulsions has been described by Sim et al. (1976), and for the IV-N emulsion by Hartley and Tritton (1979). Photographic calibration is provided by two sensitometers, a seven-step linear array at the N-W corner and a 4 × 4 spot array in the S-E. During the calibration of this latter sensitometer (Dawe and Metcalfe 1981), which is a copy of a design by Schoening (1976), it became apparent that the sensitivity of the hypersensitized IIIa-emulsions in use was decreasing as a function of time in the plateholder.

Type
Contributions
Information
Publications of the Astronomical Society of Australia , Volume 4 , Issue 4 , 1982 , pp. 466 - 468
Copyright
Copyright © Astronomical Society of Australia 1982

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References

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