•  
  •  
 

Authors

David E. Hadden

Document Type

Research

Abstract

The following paper is a resume of a series of sun-spot observations commenced by the writer in 1890, August 1st, and continued without interruption, except by cloudy weather and other unavoidable causes —such as sickness or absence from the city— until the present time.

Publication Date

1902

Journal Title

Proceedings of the Iowa Academy of Sciences

Volume

10

Issue

1

First Page

74

Last Page

98

Copyright

© Copyright 1902 by the Iowa Academy of Science, Inc.

Language

en

File Format

application/pdf

Share

COinS
 
 

To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.