USED BOOK. The author describes the fascinating transition from the early inventors’development models and instrument makers’ patent and exhibition models to the modern commercially produces ones. Contains 120 illustrations in Color and B&W. VG/VGDJ-Bottom boards very worn. London, England, 1973 Octopus Books Limited, 1st Ed., 97 Pgs., 8&1/2 x 9 &1/2, HB.