439 
1910-11.] Energy in Torsionally Oscillating Wires. 
greatly when the oscillations were small. Values got in various experiments 
were similar, the mean result being 
a = 3, n = ' 32, 6 = 5 - 6. 
Platinum Wire. 
Diameter of Wire used = -75 mm. 
This wire was kindly lent, from the Chemical Department, by Professor 
Hugh Marshall. The points plotted over the range of a hundred oscillations 
could not be brought to lie on one line, and values were got as follows : — 
A: a = 28, n= *95, 6 = 341. 
B: a = 30, n = l-05, 6 = 429. 
Nickel Wire. 
Diameter of Wire = *5 mm. 
Mr Butchart, one of the members of the Physics Research Section of 
the Scientific Society in this College, has made several experiments on 
nickel wire, and has found that over a large range it also conforms to the 
empirical equation. 
Further work will be directed to the obtaining of a relation between 
the values of a and n and temperature in the case of aluminium and some 
of the other metals showing change on heating, and to the testing of alloys 
of varying proportions of constituents. 
( Issued separately May 16, 1911.) 
