YERDET’S CONSTANT IN ABSOLUTE UNITS. 
25 
Set 3 (B). 
Passages in + direction. 
h m s 
10 48 2 
10 48 55 
10 49 46 
10 50 37i 
10 51 29 
10 52 21 
In — direction. 
h. m s 
10 48 28 
10 49 20 
10 50 lli 
10 51 3i 
10 51 55 
Mean. . 10 50 11*750 
10 50 11-550 
Time of middle negative passage : — 
h m s 
From + observations . . 
From — „ ... 
Mean .... 
. 10 50 11-750 
. 10 50 11-550 
. 10 50 11-650 
Interval between mean negative passages A and B, 14 min. 2-564 sec. 
Number of passages . . . 
Time 
. 228-1=228. 
3-6954 sec. 
Set 4 (A). 
April 28, p.m. Mean temperature 12 0, 9 C. 
Passages in + direction. 
h- m s 
2 15 
2 1 56£ 
2 2 48 
2 3 40 
2 4 31i 
2 5 23 
In — direction. 
h m s 
2 1 30i 
2 2 22 
2 3 14 
2 4 5i 
2 4 57i 
Mean ..2 3 13-972 
2 3 13-850 
Time of middle negative passage 
From + observations . . . 
From — ,, ... 
Mean .... 
h m s 
. 2 3 13-972 
. 2 3 13-850 
. 2 3 13-911 
MDCCCLXXVII. E 
