, . 14 ?. sheets. Vertical transportation components include stairs, escalators, elevators, and moving sidewalks. These are made of steel, petroleum derivatives, wiring, and aluminum. Steel and aluminum components can be supplied from lunar material; others must be brought from Earth, or redesigned to take advantage of locally available materials. Present American building systems would, by and large, withstand strains due to spin-up and the colony's continual rotation. Pluwbing networks might have to be supported more extensively and flexible connections between facilities sections devised. "Gravity" does not necessarily function as reliably in the rotating environment; vacuum pumping for waste removal may be required. Water supply would be provided through pumping. High-voltage electricity from the power station would be stepped down through transformers for domestic or institutional demand. The goal of active systems design is to provide environmental services at Earth-normal levels with Earthnormal appliances (from light switches to toilets). Vertical transportation would include stairs; ~levators and perhaps moving ramps for long uninterrupted inclines. Housing stock units would include service chases for the supply and return lines of fluid management, space conditioning, and electricity. Owners of each unit would begin with standard plumbing fixtures, electrical panels, box outlets, and kitchen appliances, adding, expanding, and altering as desired. Facilities would be broken into a series of independently-founded units with flexible connections for environmental systems to accommodate movement between facility-supported and inner-hull-supported lines. In mo;t cases, these flexible connections should be fabricated and installed after spin-up when the general range of movement is better defined. Space conditioning would include chilled water or hot water for perimeter loop convectors. Ability to affect the temperature-humidity balance of each housing stock unit, no matter how small the range, would be a significant psychological boost. The service chase should include clear space for air exhaust ducts to remove odors and heated air from the interior of units. These ducts would be filtered before outletting
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