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Noordung's concept was of a three unit space
colony: the living wheel (Wohnrad), the machine station
(Maschinenhaus), and the observatory (Observatorium): Ed.
Actually a rotating living section with a nonrotating boom for
linkage to space shuttle craft: Ed.
The remainder of the references for this
chapter, i.e., 5 through 29, is as cited by Salkeld, R.; Space
Colonization Now? Astronautics and Aeronautics, vol. l 3, no .9,
Sept .1975, pp. 30-34.