208 Г.Р. Косн. 
placed — also very accurately centred — а cylindrical food tin 
painted white. The signal thus provided was kept in place by means 
of iron wire stays. During the observation the tripod was placed 
above the signal, and the instrument was centred by means of a 
plumb, the cord of 
which was fastened 
to the hook of the 
central screw. The 
cord was passed 
through a hole in 
the surface of the 
signal, and the 
position of the 
plumb in propor- 
tion to the brass 
bolt was controlled 
through two seg- 
ments in the lower 
part of the surface 
of the cylinder (see 
Fig. 26). 
It was at the very 
last moment that 
the triangulation 
was carried out. 
When on Septem- 
ber 20th we re- 
turned from our 
last boat trip, we 
had _ repeatedly 
been forced to use 
ice-transport, and 
finally we had to 
cut and break the 
new ice for the last 
two kilometres in the harbour. On two occasions we had further 
been obliged to drag the boat across the small isthmus in the middle 
of Lille Koldewey, as the ice had blocked our passage round the 
island. Besides the fall of snow had begun to make the ascent of 
mountains more difficult. The last station, the Observatory, was 
measured on September 28th, and so we had attained the object 
aimed at and collected observation material, the computation of which 
would form a suitable occupation during the approaching winter. 
