28 ALTERNATING GENERATORS AND SYNCHRONOUS MOTORS. 
Before entering into the discussion of alternator design, it 
will be found useful as preliminary guiding information, 
to give the standard material and labor costs of different 
parts of the generator. The designer keeping these figures 
in mind, will be able to weigh the results obtained and so 
note how they affect his different designs and costs. Figs. 
5000 
/ 
° 7 
: ons 
k A 
2 é 
+ “ 
VA a 
5000 ZL alt 
yu 
1G 4 gr 
Pe ee Ld 
= CO Ss #00 $00 G00 Y%00 00 Goo s/00e 
OTFOUT IN KKA. 
Fie 14.—AVERAGE MATERIAL WEIGHTS OF SYANDARD MEDIUM 
SPEED, 50 CYCLE, POLYPHASE ALTERNATORS. 
14, 15 and 16, indicate the weights, material and labor costs 
of standard polyphase generators. In Fig. 15, the prices 
of materials are given in English shillings. (The value of 
an English shilling is about 24 cents U. S. A. money. ) 
57. Example 1.—The designer is in possession of a specifica- 
tion, which requires him to design a 600 KVA. standard 
