Assorted apparatus, including a Fenwal Thermoswitch and Thermoregulator, H-B Mercury-in-glass Thermostat, and Scaico Thermostat, used during the early stages of synthetic fiber production and research at DuPont. Typically, such apparatus were used to precisely control temperatures in both immersive and flat-surface environments. The photographs are labeled "Figure 4" and "Figure 5," indicating that they were used in a report or publication.
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“Thermoswitch and Thermoregulators Used in Production of Synthetic Fibers,” 1946–1947. Joseph X. Labovsky Collection of Nylon Photographs and Ephemera, Box 3. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/j96020667.
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