Terrestrial magnetism.
Subtitle: Horizontal intensity variometers
By: by George Hartnell, observer in charge, Cheltenham magnetic observatory ...
Contributors: Hartnell, George.
Series: Special publication,; no. 89; Special publication (U.S. Coast and Geodetic Survey) ;; no. 89.; Serial (U.S. Coast and Geodetic Survey) ;; no. 212.
Publisher: Govt. print. off.
Published: 1922
Place of publication: Washington
Language: eng
Number of pages: 62
Subjects: Geomagnetism.
Other titles: Horizontal intensity variometers.
Notes: At head of title: Serial no. 212. Department of commerce. U.S. Coast and geodetic survey. E. Lester Jones, director.
Running title: Horizontal intensity variometers.