of Metal Rods with rounded ends. 
279 
Test of 5§" Copper Rods, 2" withdrawal. 
First six readings taken, showing influence of overstrain. 
V 
z 
F 
S 
S/F 
M 
T 
12-18 
2-1 
17-3 
15-05 
1-236 
1-236 
1-845 
12-18 
2-1 
16-2 
13-95 
12-17 
2-1 
15-8 
13-55 
12-17 
2-1 
15-55 
13-3 
1217 
2-15 
15-45 
13-15 
1-081 
1-081 
1-617 
12-16 
215 
15-45 
13-15 
1-081 
Fuse key fling, T5. 
The gradual diminution of the time of impact, due to the over- 
straining of the ends of the rods, is well shown in the above table. 
Unfortunately, in subsequent observations with this pair of rods, 
great irregularities occurred in the readings, of the kind usually 
associated with dirt on the ends of the rods, and I was not able to 
get a steady value by repolishing, as was the case in other experi- 
ments. The mean of the last two readings was therefore taken as 
the time to be plotted, since it is fairly clear that overstraining 
was practically complete when they were taken. 
Test of 13|" Copper Rods, 2" withdrawal. 
V 
z 
F 
5 
5/F 
M 
T 
Initial 
12-14 
2-7 
27-3 
24-45 
2-015 
2-993 
12-12 
2-0 
24-3 
22-1 + 
1-826 
12-12 
2-1 - 
24-4- 
22-1 + 
1-826 
Steady 
12-12 
2-1- 
24-5 
22-25 
1-836 
1-830 
2-721 
12-11 
2-1 - 
24-35 
22-1 
1-827 
12-11 
2-1- 
24-45 
22-2 
1-833 
Fuse key fling, -15 for initial reading, "2 — for steady. 
