681 



in Table VI for ineicuiy. The lead resistances were arranged exactly 

 like the tin resistances described in § 14, the bare wires were wound 

 upon glass between silk. With a wire of 0.025 rnnl^ section 

 (10.8 Si resistance at ordinary temperature) containing six joints, 

 which were made with a miniature hydrogen flame, we ascertained 

 that joints do not interfere with the experiments. The results (Febr. 

 1913) with one of the wires (92 52 at ordinary temperature) are con- 

 tained in Table X (the observations were confirmed later on repetition). 

 A similar experiment with the wire containing six joints at less 

 low temperature gave ; 



At a current density of 940 the wire was dam maged (calefaction?) 

 and upon repetition it appeared that it was broken. 



Similar conditions of external conduction of heat to those of the 

 tin coil described in § 14, prevailed in a lead wire Csee § 16) of 



