The following passage is adapted from an essay on late nineteenth-century astronomy and observational documentation:
In 1897, astronomer Dorothea Klumpke was appointed by the Paris Observatory to direct the Bureau of Measurements, a specialized division tasked with analyzing glass photographic plates for the ambitious Carte du Ciel international star-mapping project. Working alongside a team of female assistants, Klumpke systematically measured the positions and relative brightness of thousands of faint celestial bodies. Throughout her work, Klumpke observed that the delicate silver-halide photographic emulsion adhering to the glass plates was uniquely susceptible to atmospheric moisture. Specifically, when ambient laboratory humidity surpassed 65 percent, the emulsion softened and peeled, obscuring critical stellar data. To preserve these vital astronomical records, the observatory commissioned custom storage facilities, housing the plates inside zinc-lined cedar cabinets designed to maintain a stable, dry microclimate.
Statement: Based on the passage, the Paris Observatory housed the Carte du Ciel photographic plates in zinc-lined cedar cabinets to protect their photographic emulsion from deteriorating due to high atmospheric moisture levels.
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