38 REPORTS ON THE STATE OF SCIENCE.—1918. 
TaBLE XV.—Impact Tension. 
Martens’ Drop Hammer. 
Test-piece 10 mm. dia. Area 78:54 sq. mm. 
Weight of tup 36 kg. Height of fall 2 mts. 
Elongation in cm. 
No. of Blow. R316 ; 59605 | RBll1- R191 
i on 4:25’ | on 2-5” 
1 1-2 i. | *haae ee 
2 a 6 / 33 33 
3 1:0 broke at | broke broke 
change of | 
section | 
4 (necked) ‘9 = Pam =e 
5 broke — = a 
| on 4:25” on ha 658 mm, 
oe a : a ! 
Total elongation 39 | 1:2 cm 1-17 | 1:70 em 
Per cent. elongation 32% | 10% 11-7 | caer 
Local elongation —_— fo + — 66 68 cm 
General elongation — —- 5% 10% 
% | 60% 60% 
Contraction of area 60% 60% 
TaBLE XVI.—Iimpact Tension. 
Martens’ Drop Hammer. 
Test-piece 10 mm. dia. Area 78°54 sq. mm. 
Weight of tup 18 kg. Height of fall 3 mts. 
Elongation in em. 
| 
2 
No. of Blow | Rll 3 | R19 3 | R3l 2} R31 5 a “Steel 7 | Steel 8 
| 
on 2” on 4:25” i on 100 mm. 
1 19 15 20 “40 20 28 ‘23cm 
2 13 13 ‘80 50 60 18 | 20 
3 14 13 “40 50 =| 20 23 =| «118 
4 | -18 10 50 40 | 30 20 | ‘18 
5 13 08 “40 “50 broke 20 | 18 
6 15 05 30 an 20 | -18 
7 18 broke “40 40 | — 23. «| 30 
8 30 _ 40 “40 — ‘25 | broke 
9 broke — ‘50 broke _ broke |§ — 
10 begs. ve ee broke — — — — 
; on100mm. on 4:25” | on 100 mm. 
Total elong. 213 | 165em.| 39 | 33 13cm.) 1-875 | 1-45cem. 
% elong. 213% |165% | 36-:0%) 31-0%| 120% | 18- 75% 145% 
Localelong. | ‘68cm.| — — — 56cm. 
General ,, | 13-0% | 95% ms cal ae ag Be, 90% 
Contr. of area | 660% |60:0% 580% 57:0% | 600% | 598% (63°1% 
IEE I I 
