831 



bottom side of the cone. The upper side of two of tlieso rones is 

 connected witli beginnini»' and end point of the vohinie wire. Only 



Fig. 10. 



the npper side is under pressure, and everything is close fitting on 

 account of the conical form, so that now we have an insulated elec- 

 trical connection with the measuring tube. 



A glass tube closed at the top, on which a platinum wire is 

 wound bifilarly is hung on the measuring tube. The ends of the 

 wire are connected with the two other copper cones. 



We shall come back to this in the description of the temperature 

 measurement. 



