PART I. ON MAGNETIC STORMS. CHAPT. I. 



55 



Curve representing the scale values of the 

 Lloyd's balance tit Matotclikia Srliar 



illiit :: 



Octbr. 



Jfovbr. 



Upclir. 



Jartr. 



Irhr. 



Mar. 



Fig. 29. 



TEMPERATURE COEFFICIENTS FOR THE REGISTERINGS. 



22. The temperature at our four arctic stations was registered all the time, simultaneously with 

 the magnetic elements. At the stations at Dyrafjord, Kaafjord, and Matotchkin Schar, the temperature was 

 registered upon the magnetogram itself. At Axeleen, it was registered by an ordinary thermograph. 

 The temperature moreover is generally given at the beginning and end of each magnetogram. 



Lloyd's balance, on all stations, except at Axeleen, were compensated for changes in temperature 

 by means of magnets which were placed at a suitable distance under the balance. The compensation 

 was tried by artificial warming of the rooms by means of hot bricks. 



In order to be able to correct the curve for changes in temperature, we must be acquainted with 

 the following particulars : 



( , or the number of degrees centigrade that answer to a deflection in the temperature-curve of i mm. 

 0;, = the number of mm. the H. I. curve is displaced in relation to the base-line per degree centigrade. 

 Od = the number of mm. the D curve is displaced in relation to the base-line per degree centigrade. 

 8 e = the number of mm. the V. I. curve is displaced in relation to the base-line per degree centigrade. 



We call these quantities positive, when the curve, by an increase in temperature, is sent upwards 

 on the magnetogram. 



The values found for our four arctic stations are given in the table below. 



TABLE VII. 



t is found by comparing the temperatures read with the ordinates to the temperature-curve. 



