AT KEW OBSERVATORY, 1890 TO 1900. 
213 
years were not treated independently, thus the results in Table IV. depend more on the 
years having many disturbed days than on those having few. No smoothing was 
applied to the disturbed curves, readings being simply taken exactly at the hours. 
Until the means were calculated, one could not but feel doubtful whether a diurnal 
Table IV.—Diurnal Inequality Disturbed Days (+ to West). 
Forenoon. 
Hour. 
i. 
2. 
3. 
4. 
5. 
6. 
7. 
8. 
9. 
10. 
11. 
12. 
January ....... 
/ 
- 6 02 
-2-77 
-2'82 
+ 0-27 
+ 0'66 
/ 
+ 0*73 
/ 
+ 1-37 
/ 
+0*97 
/ 
+ 1*22 
/ 
+2*19 
+ 3-25 
+ 4-31 
February . 
- 3-51 
-5 03 
-3-89 
-1-65 
— 0*56 
+ 1-77 
+ 0-38 
+ 0-97 
+ 1-18 
+ 1-51 
+ 3 *54 
+ 4*15 
March. 
- 4-50 
-3-89 
-6-15 
-3-23 
-0-40 
-1-01 
-0-50 
-0'38 
-0'22 
+ 2-15 
+ 4-76 
+ 6'97 
April. 
- 5-28 
-5-36 
-4'42 
-3-92 
-4-25 
-2-77 
-2-57 
-2-74 
-0'28 
+ 2'27 
+ 5-27 
+ 8-51 
May. 
- 6 "35 
-6-23 
— 5 *95 
-2-92 
-1-80 
-2-69 
-2*14 
-2-77 
-1-54 
+ 1-15 
+ 5 "36 
+ 6-37 
-6-91 
-6-15 
-3-79 
-1-90 
+ 0‘49 
-1-58 
-3-15 
-0'66 
+ 1-90 
+ 4'64 
+ 6-80 
J ulv. 
- 5 51 
-3-13 
-4-98 
-3'04 
+ 1 *76 
-2'86 
-4-53 
-2-71 
-2-28 
-0'71 
+ 1-77 
+ 6-28 
August. 
- 4-19 
-3-87 
-0-64 
-0*99 
+ 0-96 
-1-04 
+ 1-23 
-1-71 
— 1 *64 
-0-29 
+ 1-41 
+ 5'91 
September. 
- 3-59 
-4-33 
-2'74 
-1-07 
-1-44 
-0'98 
-1-21 
-0-43 
+ 0-81 
+2'72 
+ 5'86 
+ 7'90 
October. 
- 2-04 
-1-47 
— 1 "56 
-0-68 
+ 0-17 
+0-61 
+ 0-25 
-0-17 
+ 0-78 
+ 2-79 
+ 4 *57 
+6-36 
November. 
- 3-08 
-1-78 
-0-66 
0-00 
+ 1-94 
+ 1-59 
+ 4-05 
+ 1-50 
-+1-47 
+ 2-67 
+ 3-92 
+ 582 
December. 
- 4-00 
-3-53 
-2-67 
-2-03 
-0*40 
+ 0-44 
+ 0-47 
+ 1-01 
+ 0-52 
+ 2’07 
+ 1-60 
+3-98 
Hour . . . 
Afternoon. 
Range. 
Sum of 
24 
differences 
from 
mean. 
i. 
2. 
3. 
4. 
5. 
6. 
7. 
8. 
9. 
10. 
ii. 
Midt. 
January . . . 
+ 4-35 
/. 
+ 4-88 
+ 3-80 
' 
+ 3*00 
+ 0-97 
/ 
+0-59 
+ 0 -03 
/ 
-2*41 
— 5*26 
-4-77 
-5-11 
-3-41 
10-90 
/ 
65 *16 
February . . . 
+ 6 02 
+ 5-83 
+ 5-78 
+ 3-89 
+0-97 
-2-34 
-1*99 
-1-36 
-4*40 
-3-37 
-4*12 
-3-60 
11-05 
71 *75 
March .... 
+ 8-64 
+ 8 74 
+ 8-08 
+ 5-23 
+ 3-03 
+ 1-32 
-2-78 
— 4 *85 
-5-21 
-6-21 
-4-60 
-4-90 
14 *95 
97 *75 
April. 
+ 10 -68 
+ 10-75 
+ 8-49 
+ 5-83 
+ 4-04 
+ 1-62 
-1-93 
— 5 85 
-4*40 
-4-13 
-4-58 
— 4 ’95 
16 *60 
114*89 
May. 
+ 8 98 
+ 7-92 
+ 7-83 
+ 6 *97 
+ 5 *50 
+ 2-21 
+ 0-68 
-1-65 
— 4 *54 
-1-38 
-6-72 
-6-26 
15*70 
105-97 
June. 
+ 6-95 
+ 7-22 
+5'85 
+ 3-49 
+3'SO 
+ 1-63 
+ 0-61 
-0-08 
-0-86 
+ 2-94 
-6-10 
-4*82 
17 -34 
92*24 
July. 
+ 6‘86 
+ 7-73 
+ 7-20 
+ 4*55 
+ 3-45 
+ 2-52 
+ 2-21 
-2-31 
-3-09 
-2-69 
-2-46 
-4-08 
13 -24 
88-71 
August .... 
+ 7-24 
+ 7-58 
+ 6-71 
+ 5-10 
+ 2-75 
+ 0-25 
-2-47 
-7 04 
-2-86 
-4*89 
-4-80 
-2-73 
14-62 
78-30 
September. . . 
+ 8 50 
+ 7 *86 
+ 4-86 
+ 2-93 
+ 2-50 
-1*92 
-3-27 
-5-92 
-5 12 
— 5*56 
-4-52 
-1-72 
14*42 
87 *76 
October.... 
+ 6-81 
+ 6-52 
+ 4-25 
+ 1-34 
+ 0-48 
-1-03 
-4*62 
-5*48 
-4-90 
-611 
-4-26 
— 2*67 
12*92 
69-89 
November . . . 
+ 4-98 
+ 4-98 
+ 2-82 
+ 2-71 
+ 0-19 
-1-39 
-4-21 
-4*04 
-656 
— 5 *57 
-6-52 
-4-74 
12-38 
77-19 
December . . . 
+ 4-45 
+ 5-33 
+3-65 
+ 3-30 
+ 4 '09 
+ 0-92 
+ 0-74 
— 0 *4*1 
- 6-55 
-4*76 
-4-88 
-2-80 
11 -88 
65 *23 
inequality would be recognisable, thus the comparative smoothness of the results is 
not a little remarkable. 
Tables similar to III. were also formed for the years of sunspot maximum (1892 to 
1895) and of sunspot minimum (1890, 1899, and 1900) independently, but these are 
