40 REPORTS ON THE STATE OF SCIENCE.—1918. 
Test on Munition and Alloy Steels in Static Tension. 
2 a 
3 z ‘Smee ee 
Original Stress in Ibs. | $8 |@ 8) Ex 
Test Dimensions 5 = a Pa a = 
| Rannber Young’s Modulus - : = £ E 3a 
| | Per a a3 | 2 3 ai 
Diam.| Area | Total | sq: in. 4 st om 
| 2} 
j Inch | sq. in. 
| 1324 | | 
' A 20 | 29:12 108 Ibs. per | 3949 | -1224 |12,840 104,900 | 46°84 | 18:3 39 
sq. in. | | 
| 2300 | 
| BI 29-32 x 10 Ibs. per | 3938 | -1218 |12,030; 98,700 | 44-06 | 16:5 | -37 
: sq. in. | | 
| 3198 
| B24 | 29:04x10° lbs. per | 3935 | :1216 |11,800 97,000 | 43°30; 14:7 | °34 
sq. in. 
| 3184 
| B26 | 28:85x 10° lbs. per | ‘3935 | °1216 |11,340| 93,300 | 41:70 | 14-7 | -35 
} sq. in. 
| Gun 
| Steel 9 | 28-80 10° Ibs. per | 3932 | -1214 {13,880 114,400 | 51°06 | 31°65] 62 | 
sq. in. H (from 
| dia- | 
Gun | Martens’ mirrors | | gram) 
| steel 10 not used 3940 | 1219 |13,340| 109.500 | 48°88 | 381] -78 | : 
Tests on Alloy Steels in Tension. 
« 2 |efal 2 
Original Stress in Ibs. | $8 | Hes| 8 
Dimensions a | See “g 
Test Young’s Modulus So |S e| wk 
Number ay | aes} OF 
| - ————|. 23 |sge} 2° 
Di 1 ; Per 7) BS a a 
iam.| Area | Tota sq. in a 
| 
Inch | sq. in. 
Rll 1 —_ 386 | -1170 |14,110 | 120,590 | 53°83 | 50-2 | -93 
Rll 2 | 28-2210 lbs. per | -3937 | -1217 |14,160; 116,320 | 51:93 | — = 
sq. in. 
R19 1 — 3937 | -1217 |13,780 | 113,230 | 50°55 | 42-6 | -84 
Ri9 2 | 28:22x10° lbs. per | ‘3937 | +1217 |13,640| 112,100 | 50°04 | — 23 
sq. in. 
R31 1 | 29°50 10° Ibs. per | ‘3937 | -1217 | 8,900) 73,150 32°70 | 22-2 | ‘68 
sq. in. 
R31 3 | 29°30 10° lbs. per | 3937 | -1217 | 8,760| 72,000 | 32-20 | 21-1 | -66 
Sq. in. | 
5960 2 29.00 108 Ibs. per | 3937 | -1217_|13,650| 112,300 | 50-15 | 39:0 | -79 
sq. in, 
