A few useful sources are listed below.
Almgren, Frederick J., and Jean E. Taylor, "The Geometry of Soap Films and Soap Bubbles." Scientific American, 1976, vol. 235, no. 1, pp.82-93. This article is available on the jstor database (found March 2021)
Boy, Charles Vernon, Soap Bubbles: Their Colours and the Forces which Mold Them. . ., London: Society for Promoting Christian Knowledge, 1896. This volume was reprinted several times and is available online (March 2021).
Gray, Jeremy, “Plateau and Surfaces,” in Models and Visualization in the Mathematical and Physical Sciences, Oberwolfach Report 47/2017, pp. 2831-2834.
Schilling, Martin. Catalog mathematischer Modelle für den höheren mathematischen Unterricht, Leipzig: Martin Schilling, 1911, esp. pp. 21-22, 148. This is a catalog for Brill’s successor, but the series number and descriptions are the same. A scan is available online at Catalog mathematischer Mode... -- Math Models Books from the University of Illinois at Urbana-Champaign (uiuc.edu) (March 2021).
Acknowledgements
The images of the objects in this group were created through the joint efforts of conservator Mary Wilcop and photographer Harold Dorwin, with the group image prepared by Drew Robarge. Numerous others offered valuable assistance.