Memoir of Douglass Houghton First State Geologist of Michigan With An Appendix
Memoir of Douglass Houghton First State Geologist of Michigan With An Appendix
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; farther west, at the mouth of the Saginaw River, in lat. 43 deg. 36 min. 30 sec. , 2 deg. 19 min. East; at the same time it was 2 deg. 10 min. At Detroit, lat. 42 deg. 18 min.
This line of no variation, has had, for the last eighteen years, a slow and perceptible movement westward, whereby continual changes are observable in the magnetic meridian.
The rate of movement, from 1810 to 1322, . Was from 2 deg. 48 min. To 3 deg. 13 min. 22 sec, equal to 25 min. 22 sec. Increase of east variation. F...rom 1812 to 1828 a decrease from 3 deg. 13 min. 22 sec. To 2 deg. 50 min. ; (yearly differ- ence, 4 4-10) and for the last twelve years, up to 1840, a decrease 2 deg. , 50 min. To 2 deg. ; (yearly difference, 4 min. 10 sec. ) 2 deg. Being the variation at this time at Detroit, where the above observations were taken.
The progress made in the surveys of the public lands during the last three years has further developed this subject.
FIRST GEOLOGICAL SURVEY OF MICHIGAN. 149 In 1837, on Lake Michigan, near the mouth of Grand River, the variation was 4 deg.
What to read after Memoir of Douglass Houghton First State Geologist of Michigan With An Appendix?
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To quickly assess the difficulty of the text, read a short excerpt:
; farther west, at the mouth of the Saginaw River, in lat. 43 deg. 36 min. 30 sec. , 2 deg. 19 min. East; at the same time it was 2 deg. 10 min. At Detroit, lat. 42 deg. 18 min.
This line of no variation, has had, for the last eighteen years, a slow and perceptible movement westward, whereby continual changes are observable in the magnetic meridian.
The rate of movement, from 1810 to 1322, . Was from 2 deg. 48 min. To 3 deg. 13 min. 22 sec, equal to 25 min. 22 sec. Increase of east variation. F...rom 1812 to 1828 a decrease from 3 deg. 13 min. 22 sec. To 2 deg. 50 min. ; (yearly differ- ence, 4 4-10) and for the last twelve years, up to 1840, a decrease 2 deg. , 50 min. To 2 deg. ; (yearly difference, 4 min. 10 sec. ) 2 deg. Being the variation at this time at Detroit, where the above observations were taken.
The progress made in the surveys of the public lands during the last three years has further developed this subject.
FIRST GEOLOGICAL SURVEY OF MICHIGAN. 149 In 1837, on Lake Michigan, near the mouth of Grand River, the variation was 4 deg.
What to read after Memoir of Douglass Houghton First State Geologist of Michigan With An Appendix?
You can find similar books in the "Read Also" column, or choose other free books by Alvah Bradish to read onlineMoreLess
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