ll. Instruments. 
After observations at the first five stations having been taken with the 
Pettersson-Nansen insulated Water-Bottle this instrument was lost 
by an accident (the steel-line broke), and all deep-sea temperatures after 
that time were therefore taken with the Richter or Negretti and Zambra 
Reversing Thermometers. 
Richter Reversing Thermometer No. 113. 
This instrument was one of the first two reversing thermometers which 
were made at my suggestion by Richter in Berlin, and which he sent me for 
my approval in March 1901. After having tested it I sent it to Amundsen. 
The thermometer was made of Jena glass 16 III, and had a small thermo- 
meter enclosed inside the outer protecting glass-tube by which the tem- 
perature of the broken-off mercury could easily be determined simultaneously 
with the reading off. It is the same improvement which has since 
been introduced on all reversing thermometers from Richter. The scale 
was divided into fifths of degrees. The instrument had the disadvantage, 
that if it was not reversed somewhat roughly with a shock, the mercury 
would not break off. The reversing apparatus had therefore to be 
specially arranged for this purpose. 
The thermometer No. 113 was tested at Physikalisch- Teknische Reichs- 
anstalt in Charlottenburg, Berlin, in March 1901 (where it received the number 
PTR 15657) and its zero-correction was determined again (four indepen- 
dent determinations giving uniform results) on September 13, 1901, 
immediately after the the return from the expedition, by my assistant Mr. 
Jakob Schetelig at our laboratory in Christiania. 
Corrections of Richter Reversing Thermometer No. 113. 
Corrections. 
Scale. | - 
| March 1901 Char- September 1901 
lottenburg. | Christiania. 
tas © + 006° C. | = 
Od *s + 008 „ == 0'036> Gy 
‘Eo soo EEE 
” 
å 
+ 209 „ + 004 
