Survey of Northeast Greenland. 95 
can be determined (the correction for the inclination of the axis is 
isecy, where seco for Danmarks Havn is — 4.37). 
The use of very delicate levels for determining the inclinations 
will in consequence of what is stated above not answer the purpose. 
It would be better to use levels which have a somewhat stronger 
curvature than the one which is generally used for the instrument. 
These levels are quicker and more certain of adjustment, and so one 
will gain time to wipe the pivots and feet of the level, every time it 
is reversed. 
It will, I suppose, be a good plan to bring two or three levels 
of varying delicacy, each in a separate frame and ready for use. 
One might then, according to the circumstances, use the one which 
answered the purpose best. If we count upon using the observatory 
instrument on sledge trips, in other words set up on a tripod, it 
would undoubtedly also be a practical measure to carry a less deli- 
cale vertical level than the one corresponding to the permanent 
fittings of the granite pillar in the observatory. 
The watches. The fact that the box-chronometer of the ship 
had necessarily to remain on board under the special supervision of 
the officers prevented our using this watch for the purpose of Ob- 
servatory observations. Consequently for this purpose I had to rely 
entirely on pocket watches, and experience showed that they could 
yield a rate, the accuracy of which was reasonably proportionate to 
that of the observations. 
The expedition was provided with six Karrusel watches from 
B. Bonniksen, Coventry. These were first and foremost intended for 
use during sledge trips; however, it was also the idea to use them 
in an attempt to find the difference of longitude between Copenhagen 
and Greenland by portable chronometers, as well as later on in the 
permanent Observatory, for which reason two ofthem were regulated 
according to sidereal time. 
Allready during the autumn of the first year the glass of the 
mean time chronometer 57310 was broken, when we met with an 
accident on one of our sledge trips, and unfortunately it turned out 
that none of the spare glasses fitted it. It therefore became necessary 
to enclose the watch in a particular tin case, in which a glass was 
placed, but as this did not fit very tightly, the watch could not be 
used on sledge trips. So we placed it in a double watch box in the 
“Villa”, and it was afterwards used as the standard watch of the 
expedition. 
The measure adopted in a milder climate, that is to leave the 
chronometer unprotected in the observatory itself, where the changes 
XLVI. 7 
