Annexe A 
Rapport sur le Laboratoire Central à Christiania 
Report of the Central Laboratory: July 22nd 1904— July 21st 1905 
I. Supply of Apparatus: 
The expeditions are now beginning to be well supplied with apparatus and 
the result has been that the amount sent out by the C.L. this year shows a con- 
siderable diminution on last year. Nevertheless the value of the apparatus sent 
out is still about twice as great as that sent out in the first year of the C.L.’s 
existence. 
It may be mentioned here that the C.L. has been supplying a type of green 
glass bottle of 200 cm.® capacity and patent closure, particularly suitable for 
samples for ordinary titration. Price Kr. 15 per 100. 
II. Control Analysis: 
Control analyses of the water-samples sent to the C. L. from the different 
expeditions have been carried out in: the way mentioned in the last report viz., 
by Hydrostatic Weighing and by a Mohr’s Titration as control. 
II. Preparation of Standard Water: 
Owing to difficulties in getting the necessary amount of sea-water, the 
preparation of the last supply of standard water known as VI d (about 250 tubes) 
was delayed until November. As the light-conditions after that time did not allow 
of an accurate Volhardt’s titration, VI d could unfortunately for the time being, 
only be determined by a number of Mohr’s titrations, and from them the preliminary 
value Cl = 19.460 was calculated. The final exact value is being determined now 
in connection with the analysis of a further stock of standard water. 
IV. Water-bottles: 
Experiments with an Automatic Water-Bottle for taking samples and 
temperatures while under way — briefly mentioned in last year’s report — have 
