Robert H. Goddard successfully operated a liquid oxygen and gasoline rocket motor on a testing frame, both fuel components being supplied by pumps installed on the rocket. References: 17 .

Die Rakete zu den Planetenräume (The Rocket Into Interpanetary Space) by Hermann Oberth was published in Germany, and was the genesis for considerable discussion of rocket propulsion. The book would have a huge and life-changing impact on ten year old Wernher Von Braun. References: 17 .