535 
ZENITHPOINT DETERMINED ON THE SIGNAL. 
Mean | Thread- | Mean Thread- 
zenithpoint interval zenithpoint interval 
Observations 1910 3rd period Jidda 
SCHELTEMA z a iy ER als 
ie Febr. 18 | 90°12'17'4 35600) 
» 20 | 18.8 49.3 
Nov. 18 90°912'20"0 |. 5131 en Bod 4.9 44.8 
- 23 8.1 56.9 | 0491142") 150 
‘ a | =o ae Mean 90°12. 137 Set 
5 28 | 16.7 56.4 Sc See ETEN 
RES 15.8 53.9 4th period Mecca 
Mean OZ 9 5 54''6 = we ES ere Se, INE oe 
aT es Ef ae Febr. 24 90° 12' 16"4 6' 5"0 
SALIM ze 28 16.2 4.1 
et ot 16.7 13.6 
3 Sik ze erred 18.6 12.9 
Nov. 24 90° 11'52"2 5'18"1 Mean 90° 12'17'0 6’ 8'9 
Bee 26 69.9 41.2 SE a a 
5 29 BAL 4 39.6 : : 
Mean 90°12’ 20 ‚5404 Ae 
= EEE eee March 2 90° 12/21"4 5'40"3 
Observations 1911 3 25.1 51.0 
: : ä 1 28 .2 51.8 
Ist period Jidda 4 3 247 161 
; pris Leas a enk Mean 90° 12'24'8 5' 47'3 
Jan. 23 | 90°11'53"7 Badge || = as Weel aw Peal dees 
5 25 60.2 54.6 : 
: 56 41 3 50.0 6th period Mecca 
. 28 58 .0 49.7 i oe 
hele ie 48 March11 90° 12'24’'8 6 9"2 
Cte 55.8 39.4 
ave ES 31.9 11.3 
repr: (1 52.0 50.9 
G aie 23.5 8.2 
ES 60.2 53.8 
ek 32.7 TS 
EN 6 GUN ae 48.6 
| TG 38.3 5.0 
» 5 Den | VEE vin iT 35.6 6.2 
: 12 56 8 | 51.0 Mean 90° 12’ 312 6' 79 
Mean err 551 | 5'47'6 a 
[eae eS ith period Jidda 
2nd period Mecca a 
an March 19 90° 16'53''4 5'49"1 
| ze 20 67.0 525 
Febr. 15 90212302 «| BSA" Hee 49.6 | 10.0 
my 1G 17.0 | 61.4 RE 55.6 | 64.8 
Mean 90° 12136 5570 Mean 90° 16’ 56"4 | 5591 
| 
| 
In reducing the observations that value of the zenithpoint was 
used, which had been determined on the day itself. In the very 
rare cases that the signal had not been observed the zenithpoint 
has been derived from the determinations of preceding and subsequent 
days. 
