He credits Jackson with design of G. Antique# and Schroeder with design/cutting of G. Italic#.¹ The fifth one, G. Gothic#, was not patented and no other info is available in the literature. My hunch is that that Schroeder designed it and that Jackson also designed Geometric# and G. Condensed#.
¹Mullen, R.A. (2005): Recasting A Craft|St. Louis Typefounders Respond to Industrialization, pages 135-136. Southern Illinois University Press, Carbondale.