Smithsonian Institution · Washington : Smithsonian Institution · leaf 81
OF THE MAGNETIO FOROE. 57 … The vertical force appears, therefore, to be greater in May, June, July, and August, and less in the remaining months; the range is about 32 scale divisions = 0.00105 parts of the force, or 0.0135 in absolute measure.
Science
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
