UNIFICATION OF METHODS IN TESTING MATERIALS. 
XXI. 
Diameter of test piece d=25 mm. Sectional Area /'= 491 mm.? 
Remarks. 
Detail Test. 
* e 8 nd a 
B| 348 | Ee ee 
a | Avs Sacis 3| at a 
S| 4.2 |Bea)/eaé op 4° = 
g¢| Bae |Fealgee) 8 | g 
= ead Ieee logal wd a 
Bags, 4911150 rae 
3000 re Mi 
Meg (Be PCR tele 4°25 
3000 4:25 
1:41 
4000 5-66 
1:40 
5000 7:06 
1-41 
6000 8°47 
1°44 
7000 9-91 
1°41 
8000 11°32 
1°42 
9000 74 
—Limit/of Elast icity— 1°54 
10000 14:28 
1:68 
11000 15:96 
2:16 
12000 18°12 
13000 | Yield Point and 
13650 | Commencement of the 
permanent elongation. 
20300 | Maximum Load. 
__| 15800 | Load at Rupture. 
In regard to the Elongation. 
aces poe — the rup- 
tured s 
51 mm. 
mm.” 
Mean elastic elongation 
under a load of mridteeg 
Al = 0:01415 m 
Coefiicient of elasticity 
e = 21590 k. per mm. 
Coefficients of work cor- 
responding with—the 
limit of cogaeo y = 
19-4 kg. 
the yield ‘paae = 27°7 
at rupture 6 =41°2 
Elongations measured 
100 mm. \, =32°0% 
200 mm. d= 220% 
Contraction 6 = 63:5% 
Tetmaier’s Coefficient of 
quality— 
c=fBA=91 kg. mm. 
The usual way to record the 
elongation is as follows :—The total length of the test piece before 
and after the test is measured between the reference points, the 
latter is subtracted from the former, and the result multiplied 
by the length first measured and divided by 100. This method 
