Treatise on the Balance Spring. On Isohronism: A translation of the works of Eduoard Phillips on the isochronism of balance springs and pendulums. With biographical notes, by J.D. Weaver.

No place: The Antiquarian Horological Society, 1978. Softbound. Small octavo, paper covers with a black plastic comb-binding, frontispiece photo, x, 102 pp., tables and reproductions of drawings. Very Good. Item #88286

The Antiquarian Horological Society, Monograph No 15 April 1978.

Price: $45.00

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