Hookway Cowles
Cowles is credited in WorldCat library records, and British Library records, chiefly for more than a dozen volumes in the Macdonald Illustrated Edition (UK publisher ) of H. Rider Haggard novels.
He contributed illustrations to UK weeklies during the 1920s and 1930s, including The Sphere, at least 1925 to 1940; and The Tatler and/or The Bystander, at least 1921 to 1930 (from online search for credits under his full name).