0. E. SCH10TZ. 



[NORW. POL. EXP. 



There were two thermometers belonging to the pendulum apparatus of 

 the expedition, marked 23 and 24. Thermometer 23 was used in all the 

 observations carried out during the time of drifting, except the one observa- 

 tion on the ice on June 8th, 1895, when another thermometer, SODERBERG 

 No. 114, was employed, because the temperature was too low for the pendulum 

 thermometers. 



The correction for Soderberg No. 114 was zero between 7 and -(-5. 



Colonel von Sterneck has supplied the following reduction-formula for the 

 pendulum thermometers. 



Thermometer 23 t C. = 1-988 (reading 2'66) 

 24 t C. = 1-903 (reading - 2'16) 



After the return of the expedition, thermometer 23 was accidentally 

 broken while I was comparing it with a thermometer Tonnelot 4519, of which 

 the correction was determined by the "Bureau International des Poids et 

 Mesures" at Breteuil. Both thermometers, as well as a pendulum thermo- 

 meter 20, belonging to the Norwegian "Gradmaalings Kommission", were 

 hanging side by side in a vessel full of water. I had fortunately taken the 

 following readings before the accident occurred. 



July 29th, 1897. 



11-915 



10-73 



Tonnelot 4519 Pendulum therm. 20 Pendulum therm. 

 15.86 

 15.90 



16.015 11-99 10-80 



Mean 15.947 H'953 10-765 



According to Colonel von Sterneck, the reduction-formula for thermo- 

 meter 20 is: 



t C. = 1-863 (reading 3'41). 



