34 Proceedings of the Royal Society of Victoria. 



Substituting these values of (3 and ^ in the expi-essions for the 

 copper and iron losses at full load given in §§ 31, 28, we find 

 that each is equal to 200.3 . 10', that is to 200.3 watts. 



Hence the efficiency at full (inductive) load of 10 K.W. will 

 be 



10000 ^, ,, 



10400.6 ^^ percent. 



34. The numerics tj and t^ can now be determined for as 

 T-^=z4:Trzv X Conductance of primary copper belt x Permeance of 

 magnetic circuit 



"■i— *''^8(^ + ^)p 4(2^ + /3) 



400 . Tf" . 1.176 . 48.08 . 3.6 . 63.7 . 2250 



~ 8 . 14.91 . 1800 . 4 . 21.84 



= 6140, 

 and as Ti^1.02t2, 

 T,=6020. 



From the results already obtained the accurate full load value 

 of 6JJos(f> can now be calculated by means of the formula in § 17, 

 remembering that z=\. 



Thus we get at full load 



6,Cos</)=47.75. 



35. To determine //j the number of primary turns, we have 

 (see § 13), 



where M and D are the full load values of the expressions for 

 them given in !^ 12. These can now be obtained as all the 

 quantities required for their calculation are known. 



Thus M=l, D=1.044, 

 and as 



F=17450;8'^=1111.10^ (see 33), 



Ei=2200 . 1.414 . 10^ 



Zf;=1007r, 



we find that «i=854. 



