Annexe A 
Rapport sur le laboratoire central a Christiania 
Report of the Central Laboratory. July 22nd 1903—July 21st 1904 
The work in the Laboratory during the year 1903—1904 has been directed 
chiefly to the following points: 
I. Supply of Apparatus: 
The Expeditions have continued very largely to avail themselves of the 
assistance of the Central Laboratory in procuring oceanographic apparatus. 
II. Control Analysis of Water-samples: 
Three samples have been usually sent from each quarterly cruise for control 
investigation in the C. L. Green bottles with patent india-rubber stoppers have 
been supplied by the Central Laboratory for the purpose. The samples have been 
subjected to a specific gravity determination by hydrostatic weighing and to a 
weight titration of the chlorine by Vozxarp’s method. The results of the physical 
and the chemical analyses have always been in agreement with Knunsen’s Tables. 
the greatest dffference having been 0.006 °/oo Cl. As a rule however the agreement 
has been as good as about 0.002. Of late it has been thought necessary to carry 
out only the specific gravity determination, and a Moup’s titration as a rough control. 
III. Preparation of Standard Water: 
In December 1903 about 250 tubes of Standward Water VIc were. prepared. 
The amount of chlorine found by comparison with Vla (Copenhagen 1902) is 
Cl — 19.361; at the same time the preliminary value for VIb (Kristiania 1903) 
Cl = 19.393 was confirmed. In December 1903 also, about 120 tubes (mostly — 
Jenaer Geräte-Glas) were filled with a water intended as a primary standard. It 
was deemed advisable to postpone the comparison of this water ,VI Copenhagen“ 
until the summer, and it is hoped that this will now soon be accomplished. Four 
tubes of this water have also been sent to Copenhagen to be compared there, as 
well as in the C. L., with VI. 
