Fritts, Charles Edgar. [from old catalog] · Philadelphia, The Keystone · leaf 383
ell a book of two hundred for SI.00 (4s. 2dJ, prepaid, which is one-third less than the price charged by others for asimilar book. Published by The Keystone, THE ORGAN OF THE JEWELRY AND OPTICAL TRADES, 19TH & Brown Sts., Philadelphia, U. S. A. THE OPTICIANS MANUAL VOL. I. By C. H. Brown. M. D.… … Chapter I.- Chapter II.- Chapter III. Chapter IV.- Chapter V.- Chapter VI. Chapter VII.-Chapter VIII.- Chapter IX.- Chapter X.- 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…
Clocks and watches
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