Color changes in animals : Seymour Hadwen of the University of Saskatchewan (Can. J. Research, 1929, 1, 189–200) has made
✍ Scribed by J.S.H.
- Book ID
- 104127597
- Publisher
- Elsevier Science
- Year
- 1929
- Tongue
- English
- Weight
- 74 KB
- Volume
- 208
- Category
- Article
- ISSN
- 0016-0032
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✦ Synopsis
analysis of the daily variation of the earth's field indicates that the earth is not a uniformly conducting sphere but undergoes a marked change in its composition or state at a layer about 200 miles below the surface.
It is computed that from this distance to another 600 miles beneath the surface the resistivity is about 3 X 10~~. This is from 1/400 to 1/4000 of the resistivity of the dry earth or rock constituting the outer portion of the earth.
In addition to the explanation of the general magnetic fields of the earth and of the sun there remains a challenging array of lesser problems.
"The solar corona appears to indicate the existence of a magnetic field, probably of low intensity, above the chromosphere. Among the further phenomena of terrestrial magnetism, the chief are the solar and lunar daily variations, and magnetic storms with their associated aurora.
G. F. S.