D TT EE RAPPORT 1904—05 ANNEXE A 
been completed, and the instrument can now be recommended for use (See: 
Publications de Circonstance No 93). The improved model shortly mentioned 
there, on p. 23, has been adopted as the standard pattern, and can be supplied 
complete for Kr. 220. 
Supplementary to the description of the apparatus cited, it may be mentioned 
here that the tap when open, is in connection with all the concentric cylinders. 
On the other hand there is an air-hole at the upper end of the water-bottle which 
is in connection with the outer cylinder only. If it is desired to use the contents 
the outer cylinder for washing purposes only, the instrument should therefore be 
used as follows: Thermometer-reading and Indication of the Bathometer having 
been taken, the upper lid is closed and the water for washing run from the tap. 
The water sample is then taken also from the tap by raising the upper lid. 
A few experiments have been made in the Sognefjord at depths between 
100 m. and 1200 m. with the object of examining the temperature-effect due to 
the adiabatic expansion with diminution of pressure, of a PerTersson-NansEN 
insulated Water-Bottle. The results obtained verified the curves given in Fig. 3 p. 
17 of Publications de Circonstance No. 23, to within about 0,005 of a degree. 
V. Current-Meters: 
Is is believed that the C. L. has now brought to a successful completion 
its efforts at working out a reliable method of current-observation under conditions 
when it is not possible to keep an anchored ship sufficiently motionless. It may 
however be pointed out that the practical value of the method cannot be finally 
estimated except by means of a long series of experiments systematically carried 
out, and the C. L. therefore hopes for the cooperation in this direction of leaders 
of expeditions and other oceanographic investigators. 
The arrangement referred to, may be used with either of the two current- 
meters at present recommended by the C.L. It consists mainly of a Buoy of hollow 
glass-balls, a weight as anchor and a Clock-Work capable of running in water as 
well as in air. This Clock-Work releases at any two moments desired, first one 
messenger and then a second, for the starting and stopping of the Current-Meter. 
Buoy and Current-Meter are attached one at each end of a short piece of wire 
(5 m. say) and to the middle of it the Clock-Work with one or two, messengers 
(one for Nansrn’s two for Exmans Meter!) Nansen’s Current-Meter hangs freely 
from a Frame-Work to maintain for it always a vertical position in spite of a 
possible moderate inclination of the line. Clock-Work and Current-Meter having 
been adjusted, the lower end of the latter (or in the case of the Nansen Meter, 
1) See Reports for years 1902—03 and 1903—04. 
