295 
"HROW-TESTING MACHINE FOR REVERSALS OF MEAN STRESS. 
not by any means nearly approached. Diagram II. shows that in these experiments 
(Table Y.) the limiting range for cast-steel was approached very rapidly as the speed 
was diminished. 
It is almost impossible to compare the results obtained here with those given by 
Baker, as the total reversals in his case were limited to less than balf-a-million. 
Baker’s results for “fine drift steel,” of tensile strength 54 tons, elongation 14 per 
cent., are as follows :— 
Number. 
Maximum stress. 
Minimum stress. 
Range of stress. 
Reversals for rupture. 
9 
29-9 
-29-9 
59-8 
5,760 
10 
29-1 
29 0 
58-2 
7,560 
11 
23-9 
23-9 
47-8 
14,600 
12 
23-9 
23-9 
47-8 
16,300 
13 
20-8 
20-8 
41-6 
26,100 
14 
22-8 
22 • S 
45 ■ 6 
32,445 
15 
18-1 
18-1 
36-2 
157,815 
16 
15-2 
15-2 
30 ■ 4 
472,500 
Scd.Le for Wohier's <$ Baker's results. 
