8 
EXPERIMENTAL 
RESEARCHES 
ON DRAWN STEEI.. 
Table I.—Relation of Dimension Ratio to Residual Magnetic Intensity and its 
I'emperatiire Coefticient in Steel Wire. 
H 30 Piano Wire. 
Length, in centims. 
Dimension ratio. 
Demagnetising factor 
3 
16 
0-1120 
6 
32 
0-0340 
9 
48 
0-0177 
12 
64 
0-0106 
15 
80 
0 - 0069 
18 
96 
0-0040 
Amieulal. 
Intensity initially, i.c., before heating and 
cooling. 
160 
161 
276 
387 
461 
525 
Intensity finally, i.e., after heating and 
cooling. 
36 
103 
196 
290 
363 
431 
Temperature coefficient (a) x 10“^ . . . 
- 35 • 3 
-21-6 
- 14-5 
- 11-0 
-9-2 
-7-8 
Permanent loss (/3). 
- 0-78 
- 0-36 
- 0-29 
- 0-25 
-0-22 
-0-18 
(rlas.i Hard. 
Intensity initially. 
252 
483 
551 
602 
.570 
580 
Intensity finally.■. . . 
216 
437 
520 
562 
556 
569 
Temperature coefficient (a) x lO"-* . . . 
-6-03 
-2-28 
-1-17 
- 1-22 
-0-97 
-0-55 
Permanent loss {ft) . 
0-15 
-0-09 
-0-06 
-0-07 
-0-03 
-0-02 
Glass Hard, llemagnetiscd. 
- 
Intensity initially. 
299 
524 
608 
655 
681 
659 
Intensity finally. 
286 
508 
594 
643 
668 
646 
Temperature coefficient (a) x 10“^ . 
-5-26 
- 2 - 31 
- 1-47 
- 1-05 
-0-91 
-0-82 
Permanent loss (ft) . 
-0-04 
-0-03 
-0-02 
-0-02 
-0-02 
-0-02 
Cold Hravm. 
Intensity initially. 
1.37 
313 
483 
602 
683 
727 
Intensity finally. 
79 
204 
378 
514 
595 
637 
Temperature coefficient (a) x 10-^ . 
-7-32 
-1-51 
+ 0-84 
+ 2-25 
+ 2-96 
+ 3-17 
Permanent loss (ft) . 
-0-40 
-0-35 
-0-22 
-0-15 
-0-13 
-0-12 
