Papers and objects of Len Cowee The collection dates chiefly from Cowee's period at the University of London Institute of Education, 1956-1957, and is particularly concerned with the work of Christian Schiller. It consists of some papers and wooden mathematical teaching apparatus. The apparatus includes three ladders, a fraction set and a set of Napier's Bones made by Len Cowee, mostly during the period when he was a student at the Institute. c.1956-1988