The insulator test room at the Test Department at the Fourth Street General Office Building, showing transformers in the background. Photo was taken 11-10-1913. Note the stacked Imperial U-746's. Photo is a Southern Cal Edison photo which is part of the Huntington Digital Library. Southern California Edison Collection of Photographs, Courtesy of the Huntington Library, San Marino, California. [id=318887749]

Original photo: http://hdl.huntington.org/cdm/singleitem/collection/p16003coll2/id/13917/rec/1