226 
Proceedings of the Eoyal Society of Edinburgh. [Sess. 
Table II. — Mild Steel. 
Box Eesistance in Secondary Circuit = 1,000,000 ohms. 
Compression, \ 
tons per sq. in. / ‘ ’ 
0. 
25. 
35. 
40. 
45. 
50. 
Diff. 
Amps. 
Diff. 
Amps. 
Diff. 
Amps, 
Diff. 
Amps. 
Diff 
Amps. 
Diff 
Amps. 
6*7 
•33 
13*5 
1*00 
10*6 
*8 
8*0 
•55 
7*7 
*55 
2*8 
•28 
16*5 
*80 
19*2 
2*00 
16*5 
1*78 
16*8 
1*42 
16*2 
1*50 
10*9 
*83 
18*5 
1*08 
21*3 
2*93 
19*3 
2*59 
19*9 
2*44 
19*5 
2*53 
15*6 
1*58 
19*9 
1*43 
22*3 
3*71 
20*9 
3*20 
21*2 
3*37 
20*9 
3*45 
18*8 
2*63 
21*0 
1*90 
23*5 
4*90 
22*1 
3*98 
22*1 
4*22 
21*9 
4*40 
20*4 
3*79 
21*6 
2*46 
24*1 
5*74 
22*7 
4*76 
22*9 
5*07 
22*7 
5*23 
21*4 
4*63 
22*4 
3*17 
24*6 
6*70 
23*3 
5*50 
23*5 
5*83 
23*2 
6*22 
21*8 
5*42 
23*1 
3*78 
25*0 
7*29 
23*7 
6*06 
23*7 
6*50 
23*7 
7*23 
22*4 
6*47 
23*3 
23*7 
24*3 
24*7 
25*1 
25*5 
4*03 
4*69 
5*32 
6*06 
6*72 
7*41 
24*2 
24*5 
6*66 
7*20 
24*1 
7*03 
22*9 
7*25 
Original dimensions = 13*81 x 13*685 mm. 
Dimensions after 25 tons per sq. in. compression = 14*5 x 13*09 
„ „ 35 „ „ „ =14*95x12*70 
„ „ 40 „ „ „ =15*83x11*92 
„ „ 45 „ „ „ = 1 7*04 X 11*15 
„ ,, 50 „ „ ,, =18*30x10*41 
Table III. — Soft Wrought Iron. 
Box Eesistance = 1,000,000 ohms. 
Compression, \ 
tons per sq. in. / * * 
0. 
20. 
30. 
40. 
50. 
Diff. 
Amps. 
Diff 
Amps. 
Diff. 
Amps. 
Diff. 
Amps. 
Diff 
Amps. 
1*3 
*16 
1*4 
*11 
1*8 
*18 
1*7 
•15 
2*0 
*20 
8*7 
*48 
5*5 
*34 
5*6 
*33 
5*9 
•41 
9*5 
*66 
17*4 
*90 
11*5 
*67 
14*0 
*86 
13*6 
*95 
15*0 
1*40 
19*6 
1*30 
16*3 
1*17 
19*0 
1*47 
17*7 
1*60 
17*0 
2*05 
20*6 
1*65 
20*2 
1*90 
20*3 
2*03 
19*8 
2*32 
19*0 
3*10 
21*3 
2*31 
21*2 
2*60 
21*2 
2*67 
21*0 
3*00 
20*0 
3*90 
21*9 
2*92 
22*1 
3*70 
22*0 
3*33 
22*0 
3*80 
20*9 
4*60 
22*5 
3*42 
22*7 
3*75 
22*6 
3*93 
22*6 
4*50 
21*5 
5*80 
22*9 
3*70 
23*2 
4*42 
22*9 
4*32 
23*1 
5*21 
22*0 
6*80 
23*2 
4*24 
23*6 
4*95 
23-3 
4*78 
23*5 
5*85 
22*5 
7*65 
23*9 
5*37 
23*8 
5*53 
23*7 
5*52 
23*9 
6*65 
24*4 
5*99 
24*3 
6*37 
24*3 
6*39 
24*6 
7*66 
25*0 
7*13 
24*9 
7*40 
24*45 
6*86 
25*2 
7*65 
24*6 
7*23 
Original dimensions = 13*56 x 14*63 
Dimensions after 20 tons per sq. in. compression = 13*97 x 14*07 
„ „ 30 „ „ „ =14*48x13*55 
„ „ 40 „ „ „ =15*50x12*75 
„ „ 50 „ „ „ =16*80x11*75 
mm. 
55 
55 
55 
55 
{Issued separately December 3, 1915.) 
