202 I. P. Косн. 
The result of the levelling is given in the table below. 
From this it appears that the value found for the base is to be 
reduced by 0.02 m, after which the final 
Ae ; at FR 2 7 с. 
eee 5 | m value becomes: 
| | 
TG TES ST TE) B = 1449.99 m + 0.14 m. 
1.2. | Bip 21.00, 00004 
2....| 180 | 1.90 | 0.010 Before the expedition left Green- 
3.... | | TE en land, we built little cairns over the 
re Agua ih! | 0 - ee | 
5. 26 | —-0.96 | 0.002 brass bolts in the termini of the base. 
6.... | 226 | -+023.| ‘0:000 
T.... | 230 | +0.07 | 0.000 Experience gained. It was 
Q | ! | . 
8.... | _88 | +0.71 | 0.003 hardly correct, when in the course of 
| 1450 | —3.01 | 0.021 the standardization it was deemed 
sufficient to support the middle of the 
tape; it ought to have been supported throughout its entire length, 
because this corresponds more immediately with the conditions 
under which the measuring takes place. Nor was it correct when it 
was deemed sufficient to estimate the strain; it ought to have been 
measured with a little dynometer (spring steelyard) at each end. In 
the course of the measurement of the base line it gave us a feeling 
of uncertainty that we did not know for certain, how much we 
ought to stretch the tape, which uncertainty was all the more 
apparent, because we were repeatedly obliged to change our staff. 
The here-mentioned minor drawbacks have, however, hardly been 
of any importance from a practical point of wiew. 
A tape measurement ought to be performed during the autumn, 
before the beginning of the heavy fall of snow, and before the soil 
becomes too hard. Quite exceptionally one will, to great advantage, 
be able to perform a tape measuring on the new ice, and measurings 
of this kind were performed several times on the sledge trips. How- 
ever, in such circumstances one ought not to use plugs, but instead 
of that mark off the termini of the tape by means of a fine scratch 
in the ice. 
Triangulation. Surveying Operations. 
Not until the beginning of September was it possible to com- 
mence the triangulation, and from October 1st I was to be ready to 
commence the sledge-trips for laying down depots. During the month 
at my disposal the triangulation was to be carried so far towards 
west and south that during the fotlowing summer we could carry 
the triangulation net further from Orienteringsöerne (the orientation 
islands) and the interior of Dove Bugt (Dove bay). Thus as early 
as September 1906 we had to determine the position of stations on 
