ON IMPACT TESTS. 39 
TaBLE XVII.—Impact Tension. 
Martens’ Drop Hammer. 
Test-piece 10 mm. dia. Area 78°54 sq. mm. 
Weight of tup 18 ke. Height of fall 2 mts. 
Elongation in cm. 
No. of BI mies Bae | ean 4 |. suo 4 Gun Gun 
“oad | Steel 5 | Steel 6 
on 2” on 4:25" on 100 mm. 
1 13 13 30 20 18 18 
2 0s! ‘06 ‘40 20 U5) 13 
3 08 ‘ll 30 ‘20 13 10 
4 06 02 30 10 13 ‘10 
5 10 10 “40 20 13 ‘10 
6 06 ‘08 30 10 13 10 
7 06 .09 20 10 13 10 
8 06 al ‘20 20 13 10 
9 ‘10 12 30 20 13 10 
10 05 15 30 ‘10 13 10 
1l 10 broke broke broke ‘18 10 
12 10 — — — broke 10 
13 10 — a — —- oi [34 
14 14 —_— -- —_— — ‘18 
15 18 — — — — | broke 
16 broke — — — at — 
on 100 mm on 4-25" : on 100 mm, 
Shee elong. 
elong. 
Deal elong. 
General elong. 
Contr. of area 
meee ee 
215% | 15:0% 
53 ‘61 cm 
16% 9% 
63% 63% 
3:00 1:16 cm. 
27°3% | 10-6%, 
60% | 60% 
1°55 1°625 cm. 
8%  |10°5% 
585% 600% 
