Before revision: The method was pioneered by John Walton in 1928 as a method to derive serial thin-sections without the time, expense and lost material incurred by dissolving the rock.
After revision: , in collaboration with Reitze Gerben Koopmans,The method was pioneered by John Walton in 1928 as a method to derive serial thin-sections without the time, expense and lost material incurred by dissolving the rock.