TRANSFORMER CASES AND TANKS 



117 



and rigidity of the case. A cast-iron case, with rihs to increase 

 thf radiating surface, is shown in Figs. 85A and 85u. 



Another objection to the employment of cast iron for tin- 

 cases of oil transformers is the liability that hlow-holes, flaws and 



lu may occur in tin- metal. Since a transformer case muM he 



Intely oil-tij^ht, am flaw renders the case useless. Thus, 

 in the- event of requiring prompt delivery of some iarjje trans- 

 former, the loss to the manutartun r in |>ayinu f penalties incident 

 to delay may he e,,n-.iderahle if the ea-t-ii'Mii cases prove faulty 



and have to be rejected. Nevertheless, for moderately -large 



L2 



