102 
DIRECT-CURRENT DYNAMOS AND MOTORS. | 
TABLE 28. 
DATA OF BARE AND INSULATED MAGNET WIRE. 
2 3 A 5 6 vs 8 
Diam. A Numb Lbs. Lbs. 
Size, snetaee Gir. Mils, ae oe of turns per toot, per foot, Jor fast 
ab) Bere | Bae | lc. feeranem | meee | Se | dome 
1 .289 83,521 8091] 3.231] .2583 .259 ! - 900124 
2 .258 66,564 2781} 3.591] .2009 .206 ! .000156 
3 . 229 52,441 :2491] 4.011] .1593 .168! .000197 
4 . 204 41,616 .216 4.63 . 1264 1292 - 000248 
5 .182 33,124 .194 5.16 . 1002 .1023 .0003813 
6 . 162 26,244 .172 5.82 .0795 .0812 .000394 
7 1443 | 29,822 .154 6.5 . 0630 .0645 .000497 
8 .1285 | 16,512 .139 7.2 .0500 .0512 .000627 
9 .1144 | 13.087 124 8.1 . 0396 0406 .000791 
10 -10190 | 10,384 .112 8.9 .0314 . 0323 - 000992 
11 09074 | 8,284 .101 9.9 .0249 .0257 -00126 
12 .O8081 6,530 .088 | 11.4 .0198 0208 .00159 
13 07196 | 5,178 O79 | 12.7 .0157 .0161 .00200 
14 .06408 | 4,106 O71 14.1 .0124 .0128 .00252 
15 .05707 | 8,257 .064 | 15.6 .0099 01038 .00318 
16 | .05082 | 2,583 | .058 | 17.3 .0078 0081 .00401 
17 -04526 | 2,048 .050 | 20.0 .0062 .0064 .00506 
18 .04030 | 1,624 045 | 22.2 .0049 .0051 .00638 
19 .03589 | 1,288 041 24.4 . 00389 0041 .0U804 
20 .08196 | 1,021 .037 | 27.0 .0031 003825 .01014 
21 .02846 810 .033 | 30.8 .00245 00260 .01275 
22 . 025385 643 030 | 33.3 .00195 00209 .01608 
23 .02257 509 .028 | 85.7 .00154 00164 .020380 
24 -02010 404 .025 | 40.0 .00122 00133 . 02560 
25 -01790 820 023 | 48.5 .00097 00106 -03225 
6 -01594 254 021 | 47.7 -00077 00085 .04075 
27 .01420 202 019 | 52.6 -00061 00068 -05185 
28 . 01264 160 017 | 58.8 .000484 | .00054 .0648 
29 .01126 127 015 | 66.7 .000384 | .00043 .0818 
80 .01003 101 014 | 71.4 .000804 | .00084 -1030 
» Double Cotton Covered. 
Allowing 1,250 circular mils per ampere, the cross-section 
of the wire is found: 
t "4,250 x 65 81,250 circular mils, 
