With custom-bike culture exploding in recent years, the history and importance of early two-wheeled machines is often overlooked. Stock Stories tells the tales of these motorcycles. Edward Turner is well known to the classic motorcycle fraternity as an ace motorcycle designer, primarily for his work during the golden age of Triumph. https://www.hagerty.com/media/motorcycles/stock-stories-ariel-square-four/
Squires is a better illustrator than writer. no such animal as a 'vertically oriented camshaft.' Square Four cranks were connected by gears in parallel, never 'nose to tail.' We don't have aluminium here.