Survey of Northeast Greenland. 
113 
Telesc. 57203 eg : Telesc. 57202 Ree И: = 
W E calculation | W | EB |calculation 
E | Polaris 35 | 148 | | 095 W | Polaris |158| 46). 59 
| Oh23m29s | 15.3| 40|° . 004 | Ong2m3ds | 28) 14.0) 100 
В Arietis |148| 3.6| . 033 | &1 Ceti 25) 18.8 | + 110 
| 4.2| 15.5 | 16.0| 47 | 
О 59 Th “23° DB 0.44 509:'| 0 45 21:96 
28 048 21.17 45 06.1 | 21.87 
21.0 21.00 15 10) 21.86 
25.0 21.03 220 | 29.00 
37.6 20.97 | 37.2 | 21.68 
54.0 21.95 | 52.9 | 22.12 
mean E28 21.13 mean OS 21.91 
W Polaris 14.8 | 3.5 | 2. 0.05 | E Polaris | 4.5 | 15.8 ee 0.80 
| 0 32 09 34 147‘ 1033| | 0583 43 14.21 291". 110 
Hs 28 140 re о 1189] 20). a 40 
a Arietis | 15.7| 4.3 | | E? Ceti 4.8 16.0 
OBI OMS © 40 20:37 | 0 58 407 | 0 59 1145 
40 034 20.35 | 56.0 | 11.50 
16.1 20.14 | 59 11.8 | 11.30 
20.0 20.00 | 15.2 | 11.44 
37.1 20.42 | 27.2 | 11.45 
53.6 20.51 | 427 | 11.69 
mean O 40 20.30 | mean | 0 59 11.47 
The computation below of the two determinations for time has 
been made according to the formulæ: 
du = a U+ 
+t = (U +a’) = (И +a), 
_tan 9 cot 0’ sin (Ё + 1) 
tanz = — en 
NH 1 — tan д cot д' cos (Ё + В 
sin т = tan ç cot d sin x, 
To cos '/2(z' +z) {Telesc. east 
em . 
15 - -- 15есф + C SeC @ 
cos 11 (7’--2) |Telesc. west 
Here i is the elevation of the western end of the axis; c is the 
collimation constant. 
= 0.62878; !lıs рзесф = 15.30; с 
{ап x we made use of Albrecht’s auxiliary table 33. 
The single values for du here coincide very well and yield a 
A division of the level р = 4".45; log tan © 
— 15.85. At the calculation of 
mean error of the medium of less than 055. Still one should gene- 
rally not assign a value of less than about 1° to this mean error as 
also indicated by the other observations. 
The following computation is made out in all details. We have 
cos 4 (zZ + 2) В 4 
cas ea which very 
nearly becomes equally great towards east and west, and only has 
8* 
generally avoided computing the term с sec ¢ 
