34 REPORTS ON THE STATE OF SCIENCE.—1918. 
Taste [X.—Martens’ Drop Hammer. 
Weight of tup 36 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 | Hard- 
| Mark aa K.G.M. | rupture D nies Remarks 
oy 18g er 
K D° | 
Gun Steel 7} 47-02 | 15-58 18 866 248 ; : 
sag i kag | DD 17 872 | 244 [piace 
” 9 | 4602 | 15-31 19 ‘305 | 259 minutely fine 
7 10 | 44-43 | 14-64 17 861 232 +) at the edges. 
R31 1 | 37-68 | 12:56 19 661 151 
R31 2 oes oe 20 = 151 
R31 3 | 28:56 | 9:52 20 476 152 
R31 4 36-60 12-20 22 555 157 Fine crystalline. 
5960 1 | 13:80 | .4-60 7 ‘657 217 | 
5960 2 | 17:28 | 5-76 7 823 218 
5960 3 708 38 3 781 220 
Rll 1 | 63:12 | 21-04 24 877 231 
Rll 3 | 63-72 | 21-24 | 25 850 St gy ee ia 
Rll 4 | 54:60 | 1820 | 21 ‘867 216 neat ed 
R19 1 | 60-84 | 20-28 28 724 240 Ris.“ Hom 
R19 2 | 62:52 | 20-84 | 38 548 | 261 el Aim 
R19 3 | 57:60 | 19-20 23 ‘817 230 type” fracture. 
TaBLeE X.—Martens’ Drop Hammer. 
_ Weight of tup 36 kg. Height of fall 3 mts. 
Test-piece 30 x 30 x 160. Area at notch 4.5 sq. cms. approx. - 
| Energy of rupture 
| —————_——Angle of] K Hard- 
Mark Kam, K-G.M. apbure D ness cca 
"| sq. em 
| Gun Steel 11) 46-59 = 4 | 
| Gun Stee : 10-34 16 : 230 =) a: : 
| gp op 12} 68-74} 11-61 17 eae pag | | Pnocraaaas 
| a> 9 13) 59-64 | 13-16 15 ‘877 240 mnin bela sees 
| 4, o> 14 4605 | 10-19 14 728 224 ot edeet 
R31 5 13-68 -| 3-04 3 | 1-013 170 
| R3l 6 — = 2-5 ay 152 
| R31 7 918 2-04 25 ‘816 142 
| R31 8 10:26 2-28 2 | 1-14 149 ; . 
5960 5 | 24-84 | 5-52 5 | 1104 | 243 | [Fine crystalline. 
5960 6 972 | 2-16 95 227 240 
5960 7 15-30 3-40 3 | 1-133 235 
5960 8 13:32 | 2-96 4:5 658 237 
Rll 1 79:56 | 17-68 20 884 201 Minutely fine 
Rll 2 85:14 | 18-92 22 “860 194 crystalline with 
Rll 3 76:86 17-08 18 949 197 deep __ cracks. 
| Bll -4 75-78 | 16-84 18 936 210 R 191 Fine 
| R19 1 53-64 | 11-92 17 ‘701 158 crystalline with 
| R19 2 77-76 | 17-28 16 | 1-080 207 minutely fine 
| R19 3 78-30 | 17-40 20 +870 207 | | crystals at 
| R19 4 80:10 | 17:80 | 25 ‘12 | 205 |] edge. 
|. 
