Unlike woodworking education of the later years in the US, woodworking sloyd was introduced in the primary grades for the greatest benefit to the child’s growing intellect. This was in contrast to the Russian system devised by Victor Della Vos, which was intended as a vocational system to help prepare students for employment in industry. The distinctions between the two systems were greater than perceived by many. Both used series of models, but the Russian system used only parts of things rather than finished objects. Salomon's system was based firmly on his study of a long line of educational philosophers like Rousseau, Pestalozzi, Fröbel, Commenius and others. Teacher training at Nääs involved extensive lectures in the fundamental theory of education. Salomon believed that teaching was an art in itself, and that woodworking skills were of secondary importance in the teaching of sloyd. Of various educational theorists, sloyd is most closely associated with Fröbel. "Hand & Eye," an educational journal published in England from about 1890-1902, was dedicated to joint discussion of the principles of "Freobelian education" and Educational sloyd.