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Document Type

Research

Abstract

Since my report on the Dark Ring Nebula in Cygnus,1 I have received the following communication from Dr. R. H. Curtiss, Acting Director of the Detroit Observatory of the University of Michigan: "Your article in the February Popular Astronomy on a dark ring nebula in Cygnus has led me to look up an excellent slide which we have of that region made from a photograph secured with the 6-inch Willard Lens on October 5, 1893, at Lick Observatory. The dark elliptical ring stands out very beautifully on this slide. I think anyone would notice it but would be strongly tempted to ascribe it to a defect in one of the pieces of glass through which light must pass in making the lantern slide copy.”

Publication Date

1927

Journal Title

Proceedings of the Iowa Academy of Science

Volume

34

Issue

1

First Page

273

Last Page

275

Copyright

© Copyright 1927 by the Iowa Academy of Science, Inc.

Language

en

File Format

application/pdf

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