a SS.VaQVrK—e  - - 
Mark 
Mark 
ON IMPACT TESTS, 
TaBLeE XJI.—Martens’ Drop Hammer. 
Weight of tup 12 kg. Height of fall 3 mts. 
Test piece 20 x 20 x 160. Area at notch ‘3 sq. cms. approx. 
Energy of rupture 
Angle of} K 
Kem) <CAe zope}. 
sq. cm. 
K D° 
2:36 719 0 co 
115 39 0 co 
1:90 63 0 co 
2-66 89 0 co 
2:29 76 0 co 
3:73 1:25 0 co 
1:88 63 0 co 
2-53 84 0 fore) 
2°33 ‘78 0 co 
3:17 1:06 0 co 
2°22 “74 0 co 
4-75 1:56 0 co 
3:13 1:08 0 co 
4:52 1:53 2 ‘765 
2:54 86 0 co 
2:53 84 0 co 
Hard- 
ness 
169 
180 
180 
183 
202 
194 
201 
208 
194 
194 
194 
202 
187 
193 
182 
187 
| 
| 
Remarks 
| Tup 36 kg. 
Fracture : Coarse 
crystalline, 
‘3184/B26 finer 
than others, 
TaBLE XII.—Martens’ Drop Hammer. 
Weight of tup 12 kg. 
Test-piece 30 x 30 x 160. Area at notch 4°5 sq. cms. approx. 
Energy of rupture 
| 
GM. K.G.M 
sq. cm 
K 
3°85 85 
3°91 87 
3:98 “88 
4:85 1-08 
3°80 85 
5:05 1-12 
5-84 1:29 
3°82 “85 
3°83 84 
3°82 85 
6:04 1:31 
6-37 1-41 
5-18 1:15 
4:38 ‘97 
5-54 1:23 
Angle of 
rupture 
° 
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EB 88S888I83Issgss 
fon} 
a 
oa 
ol 
Hard- 
ness 
180 - 
203 
206 
210 
201 
198 
198 
207 
201 
215 
213 
209 
198 
196 
198 
187 
— 
Height of fall 3 mts. 
Remarks 
Fracture : Coarse 
crystalline. 
