Watch and clock escapements; . t\0. U. W. published by The Keystone, THE ORGAN OF THE JEWELRY AND OPTICAL TRADES, 19TH & Brown Sts., Philadelphia, THE OPTICIANS MANUAL VOL. I. By C. H. Brown, M. D. Graduate University of Pennsylvania; Professor of Optics and Refraction ; formerly Physician in Philadelphia Hospital; Member of Philadelphia County, Pennsylvania State and American Medical Societies. MANUAL Chapter The Opticians Manual, Vol. I., hasproved to be the most popular wo
Watch and clock escapements; . t\0. U. W. published by The Keystone, THE ORGAN OF THE JEWELRY AND OPTICAL TRADES, 19TH & Brown Sts., Philadelphia, THE OPTICIANS MANUAL VOL. I. By C. H. Brown, M. D. Graduate University of Pennsylvania; Professor of Optics and Refraction ; formerly Physician in Philadelphia Hospital; Member of Philadelphia County, Pennsylvania State and American Medical Societies. MANUAL Chapter The Opticians Manual, Vol. I., hasproved to be the most popular work onpractical refraction ever published. Theknowledge it contains has been moreeffective in building up the optical profes-sion than any other educational study of it is essential to an intelligentappreciation of Vol. II., for it lays thefoundation structure of all optical knowl-edge, as the titles of its ten chapters show : -Introductory Eye Anatomically. -The Eye Optically; or, The Physiology of
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