Brewed in collaboration with Blind Jack’s and Brew By Numbers. Blind Jack was the nickname of John Metcalf, born in 1717 and blind from the age of six. A brilliant civil engineer, Blind Jack was a forefather of modern roads. He invented the viameter, a rolling, measuring tool and made significant improvements to the roads between Knaresborough and Harrogate, putting Knaresborough on the map. A juicy, Session IPA.