A Caltech Library Service

Visual observations of the solar atmosphere

Hale, George E. (1926) Visual observations of the solar atmosphere. Proceedings of the National Academy of Sciences of the United States of America, 12 (5). pp. 286-295. ISSN 0027-8424.

See Usage Policy.


Use this Persistent URL to link to this item:


The spectrohelioscope, an instrument for observing the sun in monochromatic light, has been briefly described in a previous article. (1) The same optical parts employed in the preliminary work are now rigidly mounted in a vertical position in my new Solar Laboratory in Pasadena (a branch of the Mount Wilson Observatory). The second mirror of the coelostat, which stands at the summit of a low tower, sends the sun's rays vertically downward to a 30-cm. objective (kindly loaned me by the Yerkes Observatory) which forms a 5-cm. image of the sun on the slit of a spectroscope standing in a well excavated in the earth below the laboratory at the base of the tower.

Item Type:Article
Related URLs:
URLURL TypeDescription
Additional Information:Copyright © 1926 by the National Academy of Sciences. Communicated April 25, 1926.
Issue or Number:5
Record Number:CaltechAUTHORS:HALpnas26
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3954
Deposited By: Tony Diaz
Deposited On:20 Jul 2006
Last Modified:02 Oct 2019 23:08

Repository Staff Only: item control page