156 
IOWA ACADEMY OF SCIENCE 
Then the wire was heated again by an electric current to red heat, but this 
time under a load which it was to carry in the torsional experiments. No higher 
temperature was attempted for fear that the wire might permanently stretch 
under the load. The zero point after this treatment was agaih quite steady, but 
at the same time all its former peculiarities reappeared. 
Apparently the conditions under which the annealing of the wire takes place 
has a great influence upon the elastic properties of the wire, and in future ex- 
periments this point shall receive special attention. 
