2.6 The double-hull, parabolic mirror, solar cells, docking port, and transfer pod (when docked) spin together at 2 to 3 RPM, to provide a pseudogravity of .5g to lg on the inner hull in the cylindrical section. This cylindrical section, with area 6.28xl0 4 m 2 , is allocated for Earth-variety agriculture and the care of animals. The diet produced includes meat, fruits, vegetables, grain products, milk, and eggs. Crops are grown in a 30 cm deep layer of lunar dirt enriched by a nutrient solution and separated from the inner-hull surface by a 4-mil-thick layer of polypropylene. The agricultural illumination is 400 watts/m 2 . Workshops (not shown in Figure 2.3) are located in low-g areas near the spin axis, to take advantage of low-g or zero-g conditions for research and manufacturing of specialized products. The higher-g areas of the endcaps near the agricultural areas are filled by human housing and community facilities for the population of 1000 (which includes about 260 children). Housing space is divided into townhouse-model units, includes outdoor space in each unit, and provides considerable flexibility of lifestyle. Community facilities include administrative offices, shops, maintenance rooms, performing arts studios and auditoria, sports facilities, a guest hotel, a hospital, places of worship, and entertainment buildings and areas. The colony's atmosphere is a half-and-half mixture of oxygen and nitrogen at a pressure of 40530 N/m 2 (2/5 of Earth sea-level pressure), Its temperature is 295°K (72°F) and its relative humidity is 60%. These levels are maintained by a temperature and humidity control system which recirculates the total atmospheric volume every 20 minutes. This system also transfers the heat gain of the colony (3.35xl0 7 watts from sunlight and electrical consumption) to a refrigerant, and circulates this refrigerant to warm the outer hull. The outer hull in turn radiates the waste heat into space. II.4: STRUCTURAL DESIGN II.4.1: Hulls and Compartments: The separation between inner and outer hulls is 5 meters. The hulls are connected by continuous bulkheads, which run lengthwise between the tips of the endcaps
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