290 W. H. WARREN AND S. H. BARRACLOUGH. 
iss 4 
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square inch. It being impossible to use the Marten’s apparatus 
for tests in the oil bath, tests 32-38 were carried out with 
Kennedy’s apparatus at temperatures ranging from 33° to 518", 
(see Table I.), in order to determine the relation between tem- 
perature and elastic limit. These tests gave negative results, 
inasmuch as they failed to show, with certainty, any simple 
relation between the two quantities, and for this reason the tables 
and curves are not reproduced. From four of the above tests the 
inference would be drawn that the elastic limit decreased regularly 
with increase of temperature (as would probably be expected), but 
since all the tests were made with equal care, and since the 
remainder of the tests do not confirm the inference, the only con- 
clusion to be drawn is that the elastic properties of copper differ 
