200 I. P. Косн. 
length of the tape by a few millimetres, in that the tape was then 
stretched and the curves somewhat straightened out. 
Standardization of the 24-metres steel tape on 11/VI 1906. 
Length of standard base: b = 23.96870 m; t = + 19° С. 
Length of tape (in millimetres). 
N b 127.2 
b+ 10022475 = b+ 975 
b + 150-2740 = b + 29.0 
b+ 85 ONE Ь 28.5 
en 970 
Boo mn 
Gt 
After this the length of the tape at + 19° С 
L419 = 23.9965 -- 0.0009 m. 
The co-efficient of expansion of the tape was rated at 0.0000136. 
Our base in Greenland was measured six times in the course of: 
the autumn 1906. 
I. 26/IX 06, afternoon. The temperature of the earth and the snow 
varied from — 9°.0 to + 7°.0; the temperature of the air varied 
from + 8°.0 to = 7°.3. The temperature of the tape was esti- 
mated at — 7°. Length of the base 
1450.411 
= — 70 2 —= - m. 
B 60 Г. 7 + 10.621 m 100035 m 
II. 27/IX, forenoon. The temperature of the earth and the snow 
from + 7°.1 to — 77.0; temperature of the air from — 7°.3 to 
+ 5°.8 The temperature of the tape was estimated at — 6°. 
1450.470 
i 760 L=ç —- 10.680 m — 1.00034 m. 
Ш. 27/IX, afternoon. The temperature of the earth and the snow 
from + 7°.5 to +9°.0; the temperature of the air from — 6°.5 
to + 77.0. The temperature of the tape was estimated at — 7°. 
1450.619 
В = 60 L:» + 10.829 m = 1.00035 
m. 
IV. 28/IX, forenoon. The temperature of the earth and the snow 
from — 77,0 to — 594; the temperature of the air from — 6°.0 
to — 4°.5. The temperature of the tape was estimated at — 5°. 
1450.633 
В = 60 L.9 + 10.843m = gas m. 
