Published sources on these models and their makers include:
Alexander Brill, Carton-Modelle von Flächen zweiter Ordnung, construirt nach Angabe, [Germany]: L. Brill, 1874.
Alexander Brill, Mathematische Modelle angefertigt im mathematischen Institut des Königlichen Polytechnikums zu München (1880).
Ludwig Brill, Catalog mathematischer Modelle..., Darmstadt: L. Brill, 1892, p. 1, 57-59.
J. Burrow-Green, “’Knowledge gained by experience’: Olaus Henrici – engineer, geometer and maker of mathematical models,” Historia Mathematica, 2021, 54, pp. 41-76.
P. A. Kidwell, A. Ackerberg-Hastings, and D. Lindsay Roberts, Tools of American Mathematics Teaching, Baltimore: Johns Hopkins University Press, 2010, esp. pp. 226-232.
J.J. O’Connor and E.F. Robertson, “Alexander von Brill, MacTutor History of Mathematics Archive, University of St. Andrews, accessed April 16, 2021 – see https://mathshistory.st-andrews.ac.uk/Biographies/Brill/. O’Conner and Robertson mention that Brill studied in Karlsruhe from 1860 until 1863. Burrow-Green notes that Henrici studied there from 1859-1862.
M. Rowe, “Models as Research Tools: Plucker, Klein and Kummer Surfaces,” A Richer Picture of Mathematics, Springer: 2018, pp. 81-94.
M. Schilling, Catalog mathematischer Modelle für den höheren mathematischen Unterricht, Leipzig: Martin Schilling, 1911, esp. p. 1, 114, 115. 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) (accessed April 2021).
