284 I. P. Kocu. 
As the determination of time for the day in question was only 
computed after our return, we did not know the exact clock cor- 
rection while travelling. In order to get an approximate idea of the 
clock correction to be used in the course of the rough computation, 
use is made of the observation series in the subsequent midnight 
latitude (see pp. 267—268), which is performed in the same place. 
From the readings on the vertical circle in this series of observations 
it appears that the clock time of the culmination may be put at 
12514™. Hence it follows that clock correction + equation of time 
— about 14™, The result of the observation of azimuth may now, 
at an estimate, be computed in the following manner (see table on 
p. 263). 
COCA EEE son eo ae 6b33™ 
Correction — equation of time — 14m 
Apparent. time... | = 6h19m— 12h = 5h{1m Jog sin 5h41m 999 
DOF HE hacks tis nie MS Ses Е logsin 71°.3 977 
EI EN DIN RS RS SE N ale à ere К log cosec 727.0 22 
log sin a 998 
a = N84 W — 596 W 
It will be seen below that the azimuth found;in this manner 
deviates about 1°22’ from the true value. The result of the estimate 
is, however, sufficiently accurate for the making of a rough and 
ready map sketch on the sledge trip itself. 
Computation | 
Watch К....... 693372 784730 — 88.05 [rn 
Correction ..... +16 30 
Equation of time (—)3 49 
Er RE ENE 66207465 — 952115 
Ве 71°39'40"” 
Level ere + 9 
Refraction: 27. - + 310 
EN =e se sie + 1543 
Geocentric z TES SET 
ERS 83 29.3 
Giles eho 18 44.2 
