Question: What did the technical device made by the british aeronautical engineer during the second world war do? 
Sentence (from "Harry Wimperis"): Harry Egerton Wimperis {'1': ", '2': ", '3': ", '4': "} (27 August 1876 – 16 July 1960) was a British aeronautical engineer who acted as the Director of Scientific Research at the UK's Air Ministry prior to World War II.
Relevant evidence: No