DR. EYEEETT ON ATMOSPHERIC ELECTRICITY. 
35 / 
First 
year. 
Second year. 
P r 
Qr 
q 2 . 
P r 
Q,. 
P 2 . 
Or 
June 
-•139 
+ 
•185 
+ •002 
-•241 
-•218 
+ 
•114 
-•099 
-•328 
July 
-•050 
+ 
•053 
+ •164 
-•456 
-•230 
— 
•066 
+ •014 
-•364 
August 
-•083 
— 
•Oil 
+ •029 
-•507 
-•029 
+ 
•203 
-•009 
-•298 
September 
-•284 
+ 
•409 
-•002 
-•490 
-•255 
+ 
•378 
-•115 
-•467 
October 
-•053 
+ 
•835 
-•216 
-•315 
+ •284 
+ 
•586 
-•042 
-•310 
November 
— 264 
+ 
•384 
-•036 
-•214 
+ •109 
+ 
•509 
-•166 
-•371 
December 
+ •028 
+ 
•767 
-•058 
-•563 
+ •297 
+ 
•957 
-•017 
-•449 
January 
+ •006 
+ 1-060 
-•039 
— *455 
+ ■287 
+ 
1-271 
-•160 
-•297 
February 
-•051 
+ 
•743 
-•033 
-•582 
-•089 
+ 
•630 
-•236 
-•561 
March 
—119 
+ 
•008 
-•144 
-•516 
-•211 
+ 
•441 
-•127 
-•565 
April 
-•402 
+ 
•056 
-•141 
-•535 
-•304 
+ 
•311 
-•141 
-■440 
May 
-•279 
+ 
•006 
-•025 
—•322 
— 381 
+ 
•044 
+ •046 
-.95 | 
From these we derive the following values of amplitude (A } and A 2 ) and epoch 
(Ej and E 2 ), regarding the former as essentially positive. 
First 
year. 
Second year. 
A- 
Ej. 
a 2 . 
e 2 . 
1 
Ay 
E r 
a 2 . 
E g . j 
June 
•232 
- 36 53 
•241 
1 
+ 179 24 j 
•246 
- 62 28 
•343 
/ i 
+ 196 45 
July 
•073 
- 43 26 
•484 
160 15 
•240 
-105 53 
•364 
177 46 
August 
•084 
- 97 46 
•508 
176 45 
•205 
- 8 5 
•299 
181 45 
September 
•498 
- 34 47 
•490 
180 17 
•456 
- 34 2 
•481 
193 50 
October 
•837 
- 3 33 
•382 
214 21 
•651 
+ 25 53 
•313 
187 46 
November 
•466 
- 34 26 
•218 
189 39 
•521 
+ 12 3 
•407 
204 9 
December 
•768 
+ 24 
•566 
185 55 
1-003 
+ 17 15 
•450 
182 8 
January 
1-060 
+ 08 
•457 
184 39 
1-303 
+ 12 43 
•337 
208 19 ! 
February 
•743 
- 1 38 
•583 
183 14 
•636 
- 8 1 
•609 
202 51 
March 
•119 
- 87 53 
•536 
195 37 
•489 
- 25 36 
•580 
192 41 
April 
•406 
- 82 6 
•553 
194 45 
•435 
- 44 19 
•462 
197 46 
May 
•279 
- 88 48 
•323 
184 30 
•384 
- 83 29 
•201 
1 66 36 
Year 
•400 
- 20 36 
•435 
185 28 
•452 
- 7 50 
•395 
192 50 
The value of A 0 , or the mean electrical potential, is 2T4 for the first and 2T2 for the 
second year. 
It will be observed that the values of A x and E x are subject to much greater irre- 
gularities than those of A 2 and E 2 . 
The values of P 15 Q n P 2 , Q 2 for the two years combined can be correctly found by 
taking the means of their values for the two years, and the values of amplitude and 
epoch (which can not be correctly found by taking the means of their values for the 
two years) may be hence derived. The following Table has been thus computed. 
3 d 2 
