RAPPORT 1904—05 ANNEXE A — XXIV — 
the Frame) is attached to the end of the sounding line, and Buoy, Clock-Work 
and Meter are then let out, with ship steaming gently ahead. As much sounding 
line is given out as is equal to. the height above the bottom of the position 
where the measurement is required. By means of a simple mechanism a lead is 
then put on, which pulls Meter and Buoy with it on giving out more line. In 
this way the former is anchored to the bottom and without any communication 
with the ship or with the upper water layers, to prejudice the value of the record. 
It is then only necessary to keep the line steadily slack so that no pull is exerted 
on the lead by the ship, and the latter must also be kept at a distance just 
sufficient to prevent the two lines to the lead from interfering with one another. 
The apparatus is hauled in with the ship steaming gently ahead. Exman’s Current- 
Meter, must not be hauled in by the sounding line but from below the Buoy 
which is therefore taken in directly it appears at the surface. 
The method has proved surprisingly easy in practice in the case of both 
kinds of meter and at the same time reliable, as far as can be judged from the 
experiments hitherto made. 
The price of Clock-Work and apparatus for releasing messengers, is at 
present Kr. 295. 
VI. Gas-analysis: 
The C. L. is now able to supply the Gas Apparatus mentioned in the 
Report of 1903—04 and allowing of the complete determination of N,, O, & Co, 
on one and the same sample of water, for Kr. 135.00 (see Publications de Cir- 
constance No. 21). It has been found that with this apparatus the Alkalinity of 
the sample may also conveniently be determined at the same time. This is of 
importance in delimitting the amount of Carbonic Acid that the sample is capable 
of holding in solution. To determine the alkalinity a known quantity of Standardised 
Sulphuric Acid is introduced beforehand into the flask in which the sample is 
boiled; subsequently, after the boiling out and analysis of the gases shall have 
been completed, the whole of the liquid in the flask is titrated with Standard 
Alkali solution and the amount of the sulphuric acid that has been neutralised by 
the alkalinity of the sample is thus obtained by difference. To prevent the 
alkalinity of the sample being affected by solution of the glass vessel in which the 
sample has been stored, it is desirable that the samples be analysed as soon after 
collecting as possible and that the vessel be of green glass that has preferably 
been blown out with steam. 
A method of storing and sterilising samples without evacuation of the 
storage vessel has been worked oul and can be recommended for use with the 
above-mentioned apparatus. Soda water bottles are used and the accessory outfit 
