He designed stained glass windows for James Powell & Sons and also did some independent work.

[1] Some of Arnold's works were: Some of his windows are on display at the Stained Glass Museum at Ely, being lancet windows depicting Queen Victoria and Edward VII which Arnold made in 1910 for St Mary Magdalene in Barnstaple, Devon.

Arnold wrote a booklet on the stained glass of Balliol College Chapel.

He was the husband of Mary Leslie Arnold née Walker, of 85, Bedford Gardens, Kensington, London.

His name appears on the Helles Memorial[1] which commemorates the 20,956 Commonwealth servicemen of the Gallipoli campaign with no known grave.