English Electric Canberra B.2 silhouette. The 1952 edition of the Observer's Book of Aircraft used 34 Crown Copyright silhouettes provided by the Controller of H.M. Stationery.  An acknowledgements section on page 5 of the book identifies them by page.  This image is one of those and since the publication date is pre-1957 is in the public domain.
Crown Copyright
Observer's Book of Aircraft 1952, William Green and Gerald Pollinger, Fredericke Warne &amp;Co London 1952