6006346 The 1,000,000-volt testing transformer in the research laboratory at Stourport (b/w photo) by English Photographer, (20th century); Private Collection; (add.info.: The 1,000,000-volt testing transformer in the research laboratory at Stourport. Illustration for Master Minds of Modern Science by T C Bridges and H Hessell Tiltman (new edn, Harrap, 1934). Photo credit: none.); by Look and Learn; English, out of copyright.