Survey of Northeast Greenland. 201 
V. 28/IX, afternoon. The temperature of the earth and the snow 
+ 495; the temperature of the air from + 37,3 to + 37,5. The 
temperature of the tape was estimated at — 3°. 
1450.560 
Br == "I L-» + 10.770 m — 1.00031 m. 
VI. 29/IX, afternoon. The temperature of the earth and the snow 
+ 6°.5; the temperature of the air from -= 5°.0 to + 6°.5. The 
temperature of the tape was estimated at + 5°. 
1450.279 
В = 60 L: 5% + 10.489 п = 1.00033 m. 
LÉ en 1449.90 
| eee 1449.98 
Mee cet. а 1450.11 
| Peas à 1450.16 
А 1450.11 
NA JR 80 1449.80 
0.06 
Result: В — 1450.01 m + 0.14 m. 
In the spring of 1907 an attempt was made to improve the above 
value; but it failed. On March 20th and 21st the lines were measured 
three times at a temperature of the air and snow varying between 
— 19° and — 23°.5. The ice in the soil was so hard, that the plugs 
could not be driven in; only where the surface was covered by 
snow, could we make the plugs stand, though even then they were 
very far from being sufficiently firm. Otherwise the rather low 
temperature did not hinder the work. The three measurings made 
in March were all condemned. After reduction for the temperature 
of the tape, which was estimated at — 20°, the result was 
ARRETE 1449.64 
VID ee eae 144980 
Dee: 1449.86. 
The levelling of the base was performed by means of a Stampher 
levelling instrument, with horizontal sights from the exact middle. 
During this process the line was divided 
into eight sections, corresponding to , habia 
the undulation of the country. If d = 
stands for the section of the line mea- Fig. 24. 
sured and h for the dip of the country 
in the same section, whereas the horizontal distance corresponding 
to d is a, one has by the measuring of 4 committed the error а + d 
В? 
С oe te 
— m О. 5a 
