Harrison (John) A Description Concerning Such Mechanism as Will Afford a Nice, or True Mensuration of Time; Together With...Attempts for the Discovery of the Longitude of the Moon: As also...Discovery of the Scale of Musick, first edition, half-title (very lightly soiled), lacking final errata f., the occasional small marginal defect, some with silked repairs, occasional spotting, some light damp-staining to head, light browning, modern half calf, library label to upper cover, 8vo, Printed for the Author, 1775.

⁂ Harrison is best known for having solved the 'Longitude Problem' with his development of an accurate sea clock. This work concerns pendulums and their escapements, with references to the author's sea clock, and his complex proposed theory of music. Rare, we can trace only 3 copies at auction, the last in 1998.