Question: What did the technical device made by the british aeronautical engineer during the second world war do? 
Sentence (from "Beatrice Shilling"): During the Second World War, she invented "Miss Shilling's orifice", a small metal disc similar to a metal washer that restricted fuel flow to the carburetor helping prevent engine stall in the Rolls-Royce Merlin engines of the Hawker Hurricane and Supermarine Spitfire fighters, which could lose power or even completely cut out during certain manoeuvres; a significant disadvantage in active service.
Relevant evidence: Yes