ALTERNATING GENERATORS AND SYNCHRONOUS MOTORS. D9 
trical machinery in different countries, various standard 
sizes of wires are in use. 
In America, the American or 
TABLE 12A.-DATA OF BARE AND SINGLE COTTON COVERED 
MAGNET WIRE, AMERICAN OR B. & S. GAUGE. 
1 2 3 4 5 6 8 
Fi ag? Diam. Area, Di f Number Lbs. Lbs. Oh 
‘ ks -| Tnehes. | Cir. Mils. OS. of Turns | per Foot,| per Foot,| . 5) Foot 
BPR 8s Bare Bare Wire, |PetInch.| Bare 8. 0.0. 4 °0." 
G nuge. Wire. Wire. = 8.0.0. Wire. Wire. ’ 
1 .289 83,521 .309 } 3.23! | .2533 6259 } .000124 
2 .258 66,564 .278 } 3.59! | .2009 .206 * .000156 
3 .229 52,441 | .249! 4.011 | .1593 163+ | .000197_ 
oe 204 41,616 | .216 64.63 «| .1264 .1292 .000248 
5 .182 33,124 .194 5 16 .1002 .1023 .000313 
6 .162 26,244 Re 5,82 .0795 .0812 .000394 
7 .1443 20,822 .154 6.5 .0630 .0645 .000497 
8 1285 16,512 .139 2 .0500 .0512 .000627 
9 1144 13,087 .124 8.1 ,0396 .0406 .000791 
10 .10190 10,384 5113 8.9 .0314 .0323 000992 
11 .09074 8,234 101 9.9 .0249 .0257 .00126 
i2 08081 6,530 .088 11.4 .0198 .0203 .00159 
13 .07196 5,178 .079 12.7 .0157 0161 .00200 
14 .06408 4,106 O71 14.1 .0124 .0128 .00252 
15 .05707 3.257 .064 15.6 0099 .0103 .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 Bo i% .0049 0051 .00638 
19 .03589 1,288 041 244 .0039 004 L .00804 
20 .03196 1,021 .037 27.0 0031 .00325 .01014 
21 .02846 810 .033 30 3 .00245 00260 | .01275 
22 02535 643 .030 33.3 .00195 .00209 .01608 
23 .02257 509 .028 35.7 .00154 .00164 .02030 
24 .02010 404 .025 40.0 .00122 .00133 _ .02560 
25 .01790 320 .023 43.5 .00097 .00106 . 03225 
26 01594 254 .021 47.7 .00077 .00085 .04075 
27 .01420 202 .019 52.6 .00061 00068 .05135 
> 88 .01264 160 .017 58.8 .000484 .00U54 .0648 
29 .01126 127 015 66.7 .000384 .00043 | .0818 + J 
30 -01003 101 .014 71.4 .000304 .00034 .1030 
* Double cotton covered. 
Brown & Sharp (B. & S.) gauge is adopted, and in Great 
Britain the Standard Wire Gauge (S.W.G.) is used. 
Tables 12 and 12A give these Wire Gauges. 
