HOROLOGY.

Watch and Clock Maker’s Handbook, Dictionary and Guide. By F. J. Britten. Tenth edition, 450 illus. 492 pp. crown 8vo. (1902) net  50
The Springing and Adjusting of Watches. By F. J. Britten. 75 illus. 152 pp. crown 8vo. (1898) net  30
Prize Essay on the Balance Spring and its Isochronal Adjustments. By M. Immisch. 7 illus. 50 pp. crown 8vo. (1872)  26