153 
Table A. 
Electrical and Mechanical Tests of various qualities of Iron and Steel Wires. 
Quality. 
Sample No. 
Length. 
s 
bJO 
•rH 
o 
Eesistance 1 Meter 
Gramme. 
Temperature of Ex- 
periment 
Breaking Strain per 
Square Inch. 
1 Twists in Eight 
Inches. 
Elongation % 
Diameter. 
Annealed Charcoal 
Iron 
6a 
M’ts. 
8 
Grms. 
47-403 
Ohms. 
-7875 
13° 
Lbs. 
50,280 
138-5 
27-75 
Inch 
-039 
Bright ditto 
7a 
8 
47-391 
•7852 
13°-5 
105,840 
57 
2 
-038 
Dephosphorized Iron 
Annealed 
— 
5 
28-000 
-8908 
10° 
63,504 
189 
23 
•038 
Annealed Iron 
9a 
6 
35-040 
1-0123 
13° 
66,740 
134-5 
25-5 
•038 
Bright ditto 
8a 
6 
33-231 
1-0696 
ll°-5 
112,896 
49-5 
0-75 
•038 
Mild Steel Annealed . 
5a 
6 
32-890 
1-1140 
12°-5 
70,268 
207 
19 
•038 
Ditto do. Bright. 
4a 
6 
33-291 
1-1270 
15°-5 
98,784 
46 
1-25 
•038 
Annealed Steel 
3a 
8 
46-286 
1-2520 
15° 
95,256 
149 
16-25 
•038 
Bright ditto 
2a 
3-50 
20-081 
1-2470 
14°-5 
132,600 
69 
1-5 
•038 
Hardened and Tem- 
pered ditto 
la 
5-20 
29-500 
1-2832 
13°-5 
134,244 
96 
1-5 
•038 
Annealed Piano Steel 
— 
4 
28-930 
1-3422 
10°-25 
127,840 
152 
9-5 
•043 
Hardened and Tem- 
pered Steel (Piano). 
— 
5 
35-230 
1-4497 
ll°-25 
287,540 
75 
2-62 
•043 
