ALTERNATING GENERATORS AND SYNCHRONOUS MOTORS. 121 
of standard 50 cycle polyphase alternators, together with 
the characteristics, peripheral speed and factor f. 
The output of the various machines is about 75% of the 
TABLE 16.—LEADING DIMENSIONS OF STANDARD 50-CYCLE 
POLYPHASE ALTERNATORS. 
V; Dimensions in Inches. 
Num-| Num-| vel, in; 
K.V.A.| R.P.M.| ber of | her of] Ft, per f, Output 
Poles.| Slots.| “yin. Coeffic. rN B o | pb L 
25 | 1,000 6 36 | 4,200 | 72 x 10? | 22| 15.84) 8 | 16] 7.00 
50 | 1,000 6 36 | 5.200 | 64 * 27| 19.80} 10 | 20} 800 
100 750 8 48 | 5,300 |; 52 * 35| 26.76) 16 | 27} 9.50 
200 600 | 10 60 | 5,900 | 48 * 50} 37.68) 23 | 38) 1100 
_ 300 430 | 14 84 | 5,900 | 42.5 * 76| 51.60| 37 | 52} 11.00 
500 375 | 16 96 | 6600 | 39 ‘* 82| 66.52! 51 | 67} 11.50 
750 300°} 20 120 | 6600 | 345 ** |102|) 83.45] 68 | 84] 12.00 [ 
1,000 250 | 24 144 | 6,900 | 32.5 ‘* |120| 101.40] 85 | 102] 12.50 | 
figures indicated in Table 16, if they are to supply single 
phase current. 7 
19%. Output Constant.— Table 17 gives the outputs of 
TABLE 17.—OUTPUTS FOR STANDARD 
ALTERNATORS FOR LOW, MEDIUM AND HIGH 
TENSIONS. 
Low and Medium Tension. High Tension. 
Type. 
Volts. Output. Volts. Output. 
1 500 10 KVA. 1 000 8 KVA, 
2 1.000 | ee 2,000 16% -:34 
3 3,000 lead 6,000 ae 
4 3.000 100.0 8 6.000 A Ea te 
5 3 000 200.) 284 6,000 5 | | 
6 5.000 SO 88 10,000: 220 ** 
7 5,000 poo .§ 10,000 400...‘ 
8 .5,000 soe a8 10,000 550 = 
9 5,000 1,000 ‘*§ 10,000 S00... -** 
standard alternators for low, medium and high tension. 
The reduction in the output of high tension machines is 
