130 
MR. IT. TOMLINSON ON THE INFLUENCE OF STRESS 
Fig. 18. 
Experiment L V. 
An annealed pianoforte-steel wire, '085 centim. in diameter, was loaded for some hours 
with a weight of 10 kilogs. ; this was then removed and a rest of 24 hours allowed, 
when a weight of 4 kilogs. was left permanently on the wire and the elasticity 
determined at the ordinary temperature of the room, and at 100° C., by putting on and 
taking off a load of 6 kilogs., the recovery being quite perfect for the load at both the 
higher and the lower temperatures.* 
Number of trial. 
Alteration of 
length produced 
by 6 kilogs. at 
12° C. in 
half-millims. 
Alteration of 
length produced 
by 6 kilogs. at 
100° C. 
Alteration of 
length produced 
by 6 kilogs. 
after cooling to 
12° C. 
1 
1-48 
1-49 
1-45 
2 
1-50 
1-49 
1-46 
3 
1-51 
1-50 
1-44 
4 
1-51 
1-48 
1-44 
5 
1-51 
1-48 
1-46 
6 
1-48 
Mean. 
1-502 
1-487 
1-450 
Probable percentage T 
of error . j 
■40 
•27 
•30 
* At the higher temperature after the first loading, which was not taken into consideration in estimating 
the elasticity. 
