The Museum of Natural History in London exemplified the state of environmental services when it was built in 1873. Although the admirable qualities of the building's natural lighting have sometimes been noticed, other aspects of its environmental design have drawn little comment. This paper explores the fabric of the building behind the scenes, related to the integral construction for ventilation. Recent on-site investigations under the floor of the basement, within the attics and elsewhere, reveal the former presence of a comprehensive fresh-air ventilation system of surprising versatility before the advent of electrically-driven fans. Archival documents provide details. The design and performance of such fresh-air systems inform us about the evolution of building services and about the practice of architecture and engineering as distinct professions. And the forgotten knowledge revealed may serve to help in the design of natural and low energy systems for large buildings today.
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