PRITCHARD (Charles) - A Treatise on the Theory of Couples, to which is added, a simple Method of investigating the Ellipticity of the Earth considered as a Heterogeneous Spheroid.

Cambridge: Printed by J. Smith, Printer to the University, 1831. First edition, 8vo, v, [1], 42pp., a few Ms. notes in the text, folding plate, disbound pamphlet. Charles Pritchard "communicated to the Cambridge Philosophical Society a paper on the 'Figure of the Earth,' and he published in 1831 a 'Treatise on the Theory of Couples,' which was adopted in the teaching of the university, and reached a second edition in 1837." - DNB.

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