RAKETENFLUGTECHNIK. München und Berlin: Verlag von R. Oldenbourg, 1933. Octavo, pp. [i-v] vi [vii] viii-ix [x] 1-222 [223-224: ads], 92 diagrams in the text, original gray cloth stamped in black, top edge stained black. First edition. "The long gap between von Opel's rocket-propelled glider and the modern work on rocket airplanes is filled by just one name: that of the Austrian engineer Eugen Sänger. He was indubitably the first among rocket aircraft designers who did not grope and hope but attacked the problem systematically. He began his career as a rocket expert with an extensive series of rocket-motor tests conducted in the laboratories of the Technical University of Vienna" (Ley). The tests were highly successful and are described in the present book for the first time. For a description of Sänger's experiments refer to Ley's Rockets, Missiles, and Space Travel, revised edition, 1957, p. 408-09 and Von Braun and Ordway, History of Rocketry & Space Travel, p. 73. This "book has become very rare and much sought after" (Interlibrum). Ciancone 203. Hübner 707. Humphries, Rockets and Guided Missiles 11. Interlibrum 270 #308. Ley, Rockets, Missiles, and Space Travel, revised edition, 1957, p. 507. Some wear to cloth at corner tips, a very good or better copy. (#135742).