BJØRN HELLAND-HANSEN AND FRIDTJOF NANSEN. 



M.-N. Kl. 



Only one of the two Nansen-thermometers was employed, viz. No. 952 

 (from C. Richter, Berlin). When tested at the "Physikalisch-Technische 

 Reichsanstalt" of Charlottenburg on January 13, 1910 (where it received 

 the number PTR 37344), the following corrections were found: 



" 8° 120 C. 



at o" 



k — 0.02*^ 



4 

 0.02 



Fig. 2. Vertical Temperature-Curves. The readings of the 

 Nansen-thermometer (marked with dots) have not been corrected. 



O n^ 



WO 



200 



300 



-WO 



SOG 



600 



700 



800- 



900- 



WOO 



1100 



1200 



-{- 0.0 1 Z 



Another deter- 

 mination of zero on 

 April 30th, 1910. 

 gave the same cor- 

 rection at o" (^ — 

 — 0.02O C). On 

 August 22nd, 1910, a zero-deter- 

 mination was made on board the 

 "Farm", and it was found that 

 the indication was 0,12 ^ too low. 

 On March 23rd, 191 1, the ther- 

 mometer was examined again ; 

 in melting ice it gave a reading 

 of — 0.135° C, due to a small 

 drop of mercury in the upper 

 bulb of the thermometer. This 



drop of mercury had evidentl}'' 



remained unaltered in the upper bulb since the 



testing on board, but it is difficult to tell when 



the drop at first appeared. The observations 



seem to give considerably lower values than 



might be expected at some of the stations; this 



is partly indicated by the difference between the temperatures 



found by the insulated water-bottle and those found by the 



reversing thermometer in lower depths. It is therefore very 



probable that the small drop of mercury in the upper bulb 



has varied in size, and has at times been considerably larger 



than it was found to be after the return of the expedition. 



This has probably been the case during the first period of the expedition, 



at Stats. I — 14 in June, 1910 (Sections I, II, and III). 



Fig. 2 shows the vertical temperature-curves of Stats. 3 and 6 

 (Section I), of Stats. 23 and 25 (Section IV), and of Stat. 20 (Section VI, 

 cfr. the chart, Fig. i). The curves of the two stations of Section I 



