DIRECT-CURRENT DYNAMOS AND MOTORS. 85 
._ lar kind of iron used and for the flux density employed in 
that part of the circuit, and in multiplying the value so 
found by the mean length of the magnetic path in the 
TABLE 26. 
SPECIFIC MAGNETIZING FORCES FOR VARIOUS 
DENSITIES IN DIFFERENT MAGNETIC MATERIALS. 
Ampere-Turns per Inch Length of Circuit, H’’. 
Flux Density 
kif 
<1 peed Annealed ; 
sq. in. Soft Very Soft | Ordinar 
- si ae Cast Steel. Cash Tron. | Cast feen . 
5,000 1.7 2.8 10 13 
10,000 Rd 3.7 14 19 
15,000 2.0 4.3 18 24 
20,000 3.0 5 24. 31 
25.000 4,5 5.8 31 40 
30,000 ar) 6.6 42 50 
35,000 6.5 4.0 54 65 
40,000 1.9 -8.8 ‘% 88 
45,000 8.5 10 95 116 
50,000 9.6 12 128 160 
65,000 1] 14 170 R22 
60,00 13°: 16 230 295 
65,000 16 19 300 400 
70,000 20 aa 400 570 
75,000 25° rat 525 oe 
80,000 31 34 700 
85,000 40 44 eh 
90,000 5) 57 
95,000 67 te 
100,000 91 100 
105,000 137. 160 
110,000 290 3825 
115,000 500 550 
120,000 700 750 
125,000 900 950 
130,000 11¢0 1150 
