As well as going into detail regarding early Leica screw bodies and prototypes, this book provides a valuable insight into the Leitz company and its origins. There's a fascinating article by Leica inventor Oskar Barnack himself entitled How The Leica Was Created, plus original drawings. The book also covers the Leica 250 Reporter, Barnack's experimental Cine camera, and Clockwork Panoramic camera, plus various screw bodies. 94 pages with black and white illustrations. Softback.