1865.] 



and Viscosity of Metals. 

 TABLE {continued). 



295 



Remarks. 



c A piece of the preceding stretched. 



d The preceding made red-hot in a crucible filled with powdered charcoal and allowed 

 to cool slowly, became very brittle : a part of it with difficulty saved for the ex- 

 periment. 



e Another piece of the long (2435 centims.) wire ; stretched by successive simple 

 tractions. 



f A finer-gauge copper wire; stretched by successive tractions. 



B Old copper wire, softened by being heated to redness and plunged in water. A 

 Iengthof260centims.cutfromthis,suspended, and elongated by successive tractions. 



h Another length of 260 centims. cut from the same and similarly treated. 



1 One piece, successively elongated by simple tractions till it broke. 



k Not stretched yet for a second experiment. 



1 Added, May 27, after the reading of the paper. 



