Permeability of Iron and Steel. 
G. Forged Ring Crown Iron. 
Mean diameter. . d@ =21°5  centim. 
Bar-thickness . . 2R= 2°535 
Number of coils . n =989. 
7) 
pcale.= 290 (14-3 cos 0) + 2000{sin 8+4sin 26}, 
where 
e_ 8 decrees 
100° 
pH. pt. 
BG. ie Ee a Da rice So 5: (ee ete te Dilrs 
Obs. | Cale. Obs. | Cale. 
a | Jae aa 11970 | 1555 | 1525 | — 30. 
448-17 | 765 | 669| — 96 || 13710 | 1192 | 1047 | — 45 
19725 | 1615 | 1419 | —196 || 14426 | 832| 867] + 35 
6363-7 | 2501 | 2544| + 43 || 15505 | 664| 620| — 44 
90033 | 2241 | 2280] + 48 || 16042 | 395 | 512| +117 
11090 | 1763 | 1773/ + 10 || 17586 | 145 | 930] + 85 
H. Forged Ring Crown Iron. 
Mean diameter. . d =10°735 centim. 
iBar-thickness.. . 2KR= ‘7137 -,, 
Number of coils . » =560. 
p cale.=217 +164 cos 0+ 1400{sin 6+ 3 sin 263, 
where 
£8 
= 100 degrees. 
p. 
5. BLU Sk ay JES ED Dire: 3. es Be Se DS 
Obs. | Cale. Obs. | Cale. 
34:37 395 | 394 | — 
286°85 418 | 486 | + 
1079°4 817 | 769 | — 
6025°5 1797 | 1816 | + 
+ 
+ 
1 || 11261 | 1134 | 1198 | + 64 
68 || 13355 885 | 769 | —116 
48 || 14501 630 | 557 | — 73 
19 || 14718 502 | 519 | + 17 
54 || 15409 954 | 407 | +153 
29 || 17642 Oe Og: | eI 
7704-6 LIVE RAT 
8435°7 1710 | 1681 
9739°6 1354 | 1498 
