Public domain. Cover image from Project Gutenberg ebook #67386. A Preliminary Dissertation on the Mechanisms of the Heavens by Mary Somerville Download .m4b · 143 MB How to listen → · Problem with this narration? Let us know → Narrator Eleanor — English RP Narrator (en-GB) Length 2 hr 21 min Language English Added November 8, 2026 Source ebook Project Gutenberg License Public domain Nonfiction