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60
GAUSS AND WEBER ON TERRESTRIAL MAGNETISM.
With this view the mean values for every twelve months have in the first place been calculated. They are:
8, a. m. | 1, p. m. | |
1834—1835 | 18 37 12·5 | 18 45 27·0 |
1835—1836 | 33 42·0 | 43 44·8 |
1836—1837 | 27 20·3 | 40 14·6 |
These mean values correspond to the middle day of each year of observation, i. e. to the 1st of October 1834; and so forth.
The comparison of the separate months of each year with the corresponding mean value, gives the following differences:
Declination, 8, a.m.
First Year. | Second Year. | Third Year. | Mean. | |
April | − 1 5·9 | − 0 44·3 | − 0 47·4 | − 0 52·5 |
May | − 0 44·6 | − 1 28·6 | + 0 40·5 | − 0 30·9 |
June | + 0 27·9 | − 0 45·6 | + 0 14·8 | − 0 1·0 |
July | + 0 44·7 | + 0 26·0 | − 0 26·1 | + 0 14·9 |
August | + 1 35·3 | + 0 30·4 | − 1 37·9 | + 0 9·3 |
September | − 0 14·4 | − 0 20·8 | − 1 5·7 | − 0 33·6 |
October | + 0 5·6 | − 0 19·0 | + 0 13·7 | −0 0·1 |
November | + 0 25·6 | + 2 33·3 | + 2 0·7 | + 1 39·9 |
December | + 0 42·0 | + 1 43·9 | +1 53·4 | + 1 26·4 |
January | + 0 38·7 | + 1 20·4 | + 0 15·0 | 0 44·7 |
February | − 0 9·3 | −0 15·3 | + 0 15·3 | − 0 3·1 |
March | − 2 25·3 | − 2 40·6 | − 1 36·1 | − 2 14·0 |
Declination, 1, p. m.
First Year. | Second Year. | Third Year. | Mean. | |
April | + 1 36·8 | + 2 46·8 | + 3 28·0 | + 2 37·2 |
May | + 1 48·4 | + 1 32·3 | + 4 22·6 | + 2 34·4 |
June | + 2 32·5 | + 0 56·5 | + 2 37·8 | + 2 2·3 |
July | + 2 52·0 | + 0 58·0 | + 2 11·4 | + 2 0·5 |
August | + 3 44·0 | + 3 12·0 | + 1 30·4 | + 2 48·8 |
September | + 1 5·3 | + 0 42·8 | + 0 45·0 | + 0 51·0 |
October | − 0 39·8 | − 0 39·5 | + 0 18·2 | − 0 20·4 |
November | − 2 22·7 | + 0 4·7 | − 3 20·3 | − 1 52·8 |
December | − 3 54·3 | − 3 25·7 | − 4 27·8 | − 3 55·9 |
January | − 3 12·6 | − 3 10·2 | − 2 28·4 | − 2 57·1 |
February | − 2 57·6 | − 2 29·6 | − 3 46·3 | − 3 4·3 |
March | − 0 31·8 | − 0 28·4 | − 1 10·4 | − 0 43·5 |
The numbers in the last column, being mean values deduced from three years' observations, are freed in some degree, though