2026-10-06 De Gruyter Brill (transcript Verlag) - Hilgenberg-OC

Page: Tristan Thielmann, "Die Wiederkehr des Raummediums Äther", in Äther: Ein Medium der Moderne (transcript Verlag; chapter pp.75-98; the page shows "© 2015 transcript Verlag"; ISBN 9783839406106; the print date was not checked). [web] https://doi.org/10.1515/9783839406106-003 Query: Google "Die Wiederkehr des Raummediums Äther" Hilgenberg. Access: paywalled (institutional login), not attempted; the first page is visible as a preview.

Found (preview, first page, German; my translation)

• Thielmann (a media scholar) opens the chapter with Hilgenberg as the example of an ether proponent who went unheard: Hilgenberg published Vom wachsenden Erdball in 1933, "in which he supposed the ether to be the cause of the Earth's mass increase"; in 1937, "as a consistent continuation of his research", he submitted the dissertation Über Strömungsversuche mit Senken und Quellen, die das Wesen der Schwerkraft grundlegend erklären; "Die Arbeit wurde abgelehnt" (the preview breaks off there).
• The same page cites Fatio de Duillier and Le Sage (push gravity; via Edwards, Pushing Gravity; Zehe), and Dayton Miller's 1925 Mount Wilson ether-drift papers, which Thielmann describes as a later successful detection of the ether. That is Thielmann's characterization; the folder document calls Miller's results flawed by spurious effects.
• Google snippet of the full chapter (via ebin.pub): Thielmann quotes Geotektonik, neuartig gesehen, S. 188, and cites Vom wachsenden Erdball, S. 29-35, together with Kokus.

Bearing on the claims

• Claim 6 / historical record: an independent academic (not an expansion advocate) gives 1937 as the year the thesis was submitted (German Wikipedia gives 1938 for the rejection; the two can both be true). Thielmann's footnotes may name the archive source for the rejection; the full chapter is needed.
• Priority 3: places Hilgenberg in the push-gravity / Le Sage family of ether-gravity theories.