262 I. P. Kocu. 
time can wait till one’s return. The means necessary for a rough 
computation of the observations are extremely simple: A refraction 
table, a small azimuth table and a few pages of a nautical almanac. 
Besides I brought a four-placed logarithm table, but on the Dan- 
mark-Ekspedition I had no occasion to use it on sledge trips’). 
The refraction table and the azimuth table were always kept on 
the first two pages of my pocket book; they would, for instance, look 
as follows: 
Refraction table?). 
Mean refraction | Temperature correction | Barometric correction 
Apparent | Mean | Temperature Factor | Barometer Factor 
zenith dist. | refraction | centigrade mean 
859 о ТВ | 780 1.03 
84.5 9.2 I AMEN 1770 1.01 
84 | 8.5 | cz DE | 1.15 | 760 1.00 
83.5 | 7.9 27 1.14 | 750 || UNS 
83 | 7.4 | +2 1.13 | 740 N: 
82.5 | 7.0 | 20 1.13 730 | 0.96 
82 | 6.6 | 218 1.19 | 720 | 0.95 
Eee 62 | 16 1.11 | 710 | 0,93 
81 | 5.9 а | 1.10 | 700 | i” 092 
8054 S|) #56 lo SD Pe Ma FOR S00 ВЯ 
80 5.3 10 | 1.08 | 680 0.90 
79 4.9 | >= Ë 1.07 | 670 0.88 
78 4.5 5 5 | 1.06 660 0.87 
77 4.1 | ae 1.06 | 650 0.86 
76 3.8 eo 1.05 | 640 0.84 
75 3.6 0 | 1.04 | 630 0.83 
74 3.3 BE) 1703 | 620 0.82 
3 | 3.1 + 4 | 1.02 | 610 0.80 
72 3.0 MOST COPA С 600 0.79 
71 2.8 | exe | 1.01 590 0.78 
70 | 2.6 Il 1.00 | 580 0.76 
65 | 21 | +12 09 | 570 0.75 
60 1.7 | +14 0.99 | 560 0.74 
55 a 516 0.98 | 550 0.72 
50 NME | | 540 0.71 
40 | 0.8 | | | 530 0.70 
30 0.6 | | 520 | 0.68 
20 | 0.4 | 510 | 067 
10 | 0.2 | 500 +» 10:66 
Ex.: zu = 78°48'.3; Е = = 22.4; b = 627.5; 
г = 483x113 x 0.83 = 4.5. 
1) Оп the voyage across Greenland in 1913 it was, оп the other hand, necessary 
to compute all the determinations of time while travelling. 
>) The members of the sledge parties of the Danmark-Ekspedition only carried 
tables of the mean refraction, in other words, without tables of correction for 
temperature and atmospheric pressure. On several occasions the table proved 
insufficient. The table reproduced in this place I used on the voyage across 
Greenland in 1913. 
