 The first step in that plan was to design and build two more small scale designs (WB-7 and WB-8) to determine which full scale machine would be best.He wrote "The only small scale machine work remaining, which can yet give further improvements in performance, is test of one or two WB-6-scale devices but with "square" or polygonal coils aligned approximately (but slightly offset on the main faces) along the edges of the vertices of the polyhedron.If this is built around a truncated dodecahedron, near-optimum performance is expected; about 3–5 times better than WB-6."