- F 16
carefully examined. It was found that the magnets were appreciably asymmetrical with respect to the mirror.
This was remedied with satisfactory results. On April 7, 10 and 28 attempts were made to eliminate the temperature co-efficient; but without complete success. The co-efficient has been greatly reduced, however.
data for the
58. The following table gives temperature data for the magnetograph room during the year 1931.
Month Temperature Daily Range Absolute Maximum Absolute Minimum Mean Maximum Minimum Mean January 74'3 60.5 67'7 5'5 0.8 1'2 February 74'0 60'2 66.1 3.3 0.6 0'7 March 75°0 63.1 69'1 4'2 0'1 1'2 April 82.6 70°7 76'2 3'5 0.6 1'0 May 87.4 80.3 83°1 2.75 0.7 1'1 June 89°0 83°1 86.0 2.8 0'6 July 90*7 85.8 88.7 2.2 0.9 1.3 August 90°2 84.2 87.7 2'3 0.6 1'5 September 89.6 82.0 87.2 3'7 0.8 1°3 October 84.8 76.2 79'7 2.8 0'5 1.7 November 78·4 73'0 75.6 2.7 0°2 1'3 December 75'1 64°2 69.9 4'2 0°3 1.2-F 16
carefully examined. It was found that the magnets were ap- preciably asymmetrical with respect to the mirror.
This was remedied with satisfactory results. On April 7, 10 and 28 attempts were made to eliminate the temperature co-efficient; but without complete success. The co-efficient has been greatly reduced, however.
data for the
58. The following table gives temperature data magnetograph room during the year 1931.
Month.
Temperature.
Absolute.
Maximum. Minimum.
Daily Range.
Mean, Maximum. Minimum. Mean.
O
о
C
January,
74'3
60.5 67'7
5'5
0.8
I'2
February,
..........
74'0
60'2 66.1
3.3
0.6
0'7
March,
75°0
63.1
69'1
4'2
0'1
1'2
April.......
82.6
70°7
76'2
3'5
0.6
1'0
May,
874
80.3
83°1
275
07
1'I
June,
89°0
83°1
86.0
2.8
0'6
July,
90*7
85-8
88.7
2.2
0.9
1.3
August,
90°2
84.2
87.7
2'3
0.6
1'5
September,
89.6
82.0
872
3'7
0.8
1°3
October,
84.8 76.2
79'7
2.8
0'5
17
November,......
78·4 73'0 7516
2.7
0°2
1'3
December,
75'1
64°2 69.9
4'2
0°3
I 2
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