Transformer core part 1  an introduction to materials, a second level course 

 - [London]  Production for Open University by BBC  1972 
 - 1 videocassette (Beta) (30 min.)  B & W  1/2 in 
<br/><br/>Credits : Film produced by Feranti Ltd.; production by Jim Stevenson 
<br/><br/><br/>Summary : Discusses why transformers are needed in electricity industry and shows the materials used for constructing the transformer core 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Electric transformers