2026-10-06 Met Office Library and Archive catalogue (UK) - Hilgenberg-OC

Record: [web] https://library.metoffice.gov.uk/portal/Default/en-GB/RecordView/Index/280883 (reached from Google query "Über Gravitation, Tromben und Wellen" Hilgenberg pdf OR digitalisat).

Found

Hilgenberg, O.C., Uber Gravitation, Tromben und Wellen in bewegten Medien, Berlin 1931, "Pp.78 + plates", German; bib no. 280883; shelf reference PAMPHLET P007(HILG); barcode 736908-1001; status "Available for Loan". [web]
A catalogue search URL for "Hilgenberg" (https://library.metoffice.gov.uk/portal/Default/en-GB/Search/SimpleSearch?term=Hilgenberg) only returned the search form; other Hilgenberg holdings (for example the 1932 vortex-ring cyclone booklet, which a meteorological library would plausibly hold) were not checked.

Claims 1, 2 and 4: the 1931 booklet holds the full statement of the ether-sink gravity theory, his own sink/source experiments (pp.14-15 per the 1933 book) and the astronomical consequences (pp.43-50, 68-72). This is a physical copy that can be requested (loan or scan request through the library's enquiry service; the owner would have to make the request).