THE WATCH ADJUSTER'S MANUAL
A Complete and Practical Guide for Watchmakers in Adjusting Watches and Chronometers for Isochronism, Position, Heat and Cold.
By Charles Edgar Fritts (Excelsior),
Author of "Practical Hints on Watch Repairing," "Practical Treatise on Balance Spring," "Electricity and Magnetism for Watchmakers," etc., etc.
This well-known work is now recognized as the standard authority on the adjustments and kindred subjects, both here and in England. It contains an exhaustive consideration of the various theories proposed, the mechanical principles on which the adjustments are based, and the different methods followed in actual practice, giving all that is publicly known in the trade, with a large amount of entirely new practical matter not to be found elsewhere, obtained from the best manufacturers and workmen, as well as from the author's own studies and experiences.
Sent postpaid to any part of the world on receipt of $2.50 (10s. 5d.)
Published byThe Keystone,the organ of the jewelry and optical trades,19th & Brown Sts., Philadelphia, U.S.A.
THE ART OF ENGRAVING
A Complete Treatise on the Engraver's Art, with Special Reference to Letter and Monogram Engraving. Specially Compiled as a Standard Text-Book for Students and a Reliable Reference Book for Engravers.
This work is the only thoroughly reliable and exhaustive treatise published on this important subject. It is an ideal text-book, beginning with the rudiments and leading the student step by step to a complete and practical mastery of the art. Back of the authorship is a long experience as a successful engraver, also a successful career as an instructor in engraving. These qualifications ensure accuracy and reliability of matter, and such a course of instruction as is best for the learner and qualified engraver.
The most notable feature of the new treatise is the instructive character of the illustrations. There are over 200 original illustrations by the author. A very complete index facilitates reference to any required topic.
Bound in Silk Cloth—208 Pages and 216 Illustrations.
Sent postpaid to any part of the world on receipt of price, $1.50 (6s. 3d.)
Published byThe Keystone,the organ of the jewelry and optical trades,19th & Brown Sts., Philadelphia, U.S.A.
THE KEYSTONE PORTFOLIO OF MONOGRAMS
Monogram
Monograms
This portfolio contains 121 combination designs. These designs were selected from the best of those submitted in a prize competition held by The Keystone, and will be found of value to every one doing engraving.
The designs are conceded to be the best in the market, excelling in art and novelty of combination and skill in execution.
They are printed from steel plates on stiff, durable paper, and contain sample monograms in a variety of combinations.
The portfolio is a bench requirement that no jeweler can afford to be without. It is a necessary supplement to any text-book on letter engraving.
Price, 50 Cents (2s.)
Published byThe Keystone,the organ of the jewelry and optical trades,19th & Brown Sts., Philadelphia, U.S.A.
THE OPTICIAN'S 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.
The Optician's Manual, Vol. I., has proved to be the most popular work on practical refraction ever published. The knowledge it contains has been more effective in building up the optical profession than any other educational factor. A study of it is essential to an intelligent appreciation of Vol. II., for it lays the foundation structure of all optical knowledge, as the titles of its ten chapters show:
The Optician's Manual, Vol. I., is complete in itself, and has been the entire optical education of many successful opticians. For student and teacher it is the best treatise of its kind, being simple in style, accurate in statement and comprehensive in its treatment of refractive procedure and problems. It merits the place of honor beside Vol. II. in every optical library.
Bound in Cloth—422 pages—colored plates and Illustrations.
Sent postpaid on receipt of $2.00 (8s. 4d.)
Published byThe Keystone,the organ of the jewelry and optical trades,19th & Brown Sts., Philadelphia, U.S.A.
THE OPTICIAN'S MANUAL
VOL. II.
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.
The Optician's Manual, Vol. II., is a direct continuation of The Optician's Manual, Vol. I., being a much more advanced and comprehensive treatise. It covers in minutest detail the four great subdivisions of practical eye refraction, viz:
Myopia.Hypermetropia.Astigmatism.Muscular Anomalies.
It contains the most authoritative and complete researches up to date on these subjects, treated by the master hand of an eminent oculist and optical teacher. It is thoroughly practical, explicit in statement and accurate as to fact. All refractive errors and complications are clearly explained, and the methods of correction thoroughly elucidated.
This book fills the last great want in higher refractive optics, and the knowledge contained in it marks the standard of professionalism.
Bound in Cloth—408 pages—with illustrations.
Sent postpaid on receipt of $2.00 (8s. 4d.)
Published byThe Keystone,the organ of the jewelry and optical trades,19th & Brown Sts., Philadelphia, U.S.A.
SKIASCOPY AND THE USE OF THE RETINOSCOPE
A Treatise on the Shadow Test in its Practical Application to the Work of Refraction, with an Explanation in Detail of the Optical Principles on which the Science is Based.
This new work, the sale of which has already necessitated a second edition, far excels all previous treatises on the subject in comprehensiveness and practical value to the refractionist. It not only explains the test, but expounds fully and explicitly the principles underlying it—not only the phenomena revealed by the test, but the why and wherefore of such phenomena.
It contains a full description of skiascopic apparatus, including the latest and most approved instruments.
In depth of research, wealth of illustration and scientific completeness this work is unique.
Bound in cloth; contains 231 pages and 73 illustrations and colored plates.
Sent postpaid to any part of the world on receipt of $1.00 (4s. 2d.)
Published byThe Keystone,the organ of the jewelry and optical trades,19th & Brown Sts., Philadelphia, U.S.A.
PHYSIOLOGIC OPTICS
Ocular Dioptrics—Functions of the Retina—Ocular Movements and Binocular Vision
By Dr. M. Tscherning
Adjunct-Director of the Laboratory of Ophthalmology at the Sorbonne, Paris
AUTHORIZED TRANSLATION
By Carl Weiland, M.D.
Former Chief of Clinic in the Eye Department of the Jefferson College Hospital, Philadelphia, Pa.
This is the crowning work on physiologic optics, and will mark a new era in optical study. Its distinguished author is recognized in the world of science as the greatest living authority on this subject, and his book embodies not only his own researches, but those of the several hundred investigators who, in the past hundred years, made the eye their specialty and life study.
Tscherning has sifted the gold of all optical research from the dross, and his book, as now published in English with many additions, is the most valuable mine of reliable optical knowledge within reach of ophthalmologists. It contains 380 pages and 212 illustrations, and its reference list comprises the entire galaxy of scientists who have made the century famous in the world of optics.
The chapters on Ophthalmometry, Ophthalmoscopy, Accommodation, Astigmatism, Aberration and Entoptic Phenomena, etc.—in fact, the entire book contains so much that is new, practical and necessary that no refractionist can afford to be without it.
Bound in Cloth. 380 Pages, 212 Illustrations.
Price, $3.50 (14s. 7d.)
Published byThe Keystone,the organ of the jewelry and optical trades,19th & Brown Sts., Philadelphia, U.S.A.
OPHTHALMIC LENSES
Dioptric Formulæ for Combined Cylindrical Lenses, The Prism-Dioptry and Other Original Papers
By Charles F. Prentice, M.E.
A new and revised edition of all the original papers of this noted author, combined in one volume. In this revised form, with the addition of recent research, these standard papers are of increased value. Combined for the first time in one volume, they are the greatest compilation on the subject of lenses extant.
This book of over 200 pages contains the following papers:
Ophthalmic Lenses.Dioptric Formulæ for Combined Cylindrical Lenses.The Prism-Dioptry.A Metric System of Numbering and Measuring Prisms.The Relation of the Prism-Dioptry to the Meter Angle.The Relation of the Prism-Dioptry to the Lens-Dioptry.The Perfected Prismometer.The Prismometric Scale.On the Practical Execution of Ophthalmic Prescriptions involving Prisms.A Problem in Cemented Bi-Focal Lenses, Solved by the Prism-Dioptry.Why Strong Contra-Generic Lenses of Equal Power Fail to Neutralize Each Other.The Advantages of the Sphero-Toric Lens.The Iris, as Diaphragm and Photostat.The Typoscope.The Correction of Depleted Dynamic Refraction (Presbyopia).
Press Notices on the Original Edition:
OPHTHALMIC LENSES.
"The work stands alone, in its present form, a compendium of the various laws of physics relative to this subject that are so difficult of access in scattered treatises."—New England Medical Gazette.
"It is the most complete and best illustrated book on this special subject ever published."—Horological Review, New York.
"Of all the simple treatises on the properties of lenses that we have seen, this is incomparably the best.... The teacher of the average medical student will hail this little work as a great boon."—Archives of Ophthalmology, edited by H. Knapp, M.D.
DIOPTRIC FORMULÆ FOR COMBINED CYLINDRICAL LENSES.
"This little brochure solves the problem of combined cylinders in all its aspects, and in a manner simple enough for the comprehension of the average student of ophthalmology. The author is to be congratulated upon the success that has crowned his labors, for nowhere is there to be found so simple and yet so complete an explanation as is contained in these pages."—Archives of Ophthalmology, edited by H. Knapp, M.D.
"This exhaustive work of Mr. Prentice is a solution of one of the most difficult problems in ophthalmological optics. Thanks are due to Mr. Prentice for the excellent manner in which he has elucidated a subject which has not hitherto been satisfactorily explained."—The Ophthalmic Review, London.
The book contains 110 Original Diagrams. Bound in cloth.
Price, $1.50 (6s. 3d.)
Published byThe Keystone,the organ of the jewelry and optical trades,19th & Brown Sts., Philadelphia, U.S.A.
OPTOMETRIC RECORD BOOK
A record book, wherein to record optometric examinations, is an indispensable adjunct of an optician's outfit.
The Keystone Optometric Record Book was specially prepared for this purpose. It excels all others in being not only a record book, but an invaluable guide in examination.
The book contains two hundred record forms with printed headings, suggesting, in the proper order, the course of examination that should be pursued to obtain most accurate results.
Each book has an index, which enables the optician to refer instantly to the case of any particular patient.
The Keystone Record Book diminishes the time and labor required for examinations, obviates possible oversights from carelessness and assures a systematic and thorough examination of the eye, as well as furnishes a permanent record of all examinations.
Sent postpaid on receipt of $1.00 (4s. 2d.)
Published byThe Keystone,the organ of the jewelry and optical trades,19th & Brown Sts., Philadelphia, U.S.A.
THE KEYSTONE BOOK OF MONOGRAMS
This book contains 2400 designs and over 6000 different combinations of two and three letters.
Is an essential to every jeweler's outfit. It is not only necessary for the jeweler's own use and guidance, but also to enable customers to indicate exactly what they want, thus saving time and possible dissatisfaction.
The Monograms are purposely left in outline, in order to show clearly how the letters are intertwined or woven together. This permits such enlargement or reduction of the Monogram as may be desired, and as much shading, ornamentation and artistic finish as the jeweler may wish to add.
This comprehensive compilation of Monograms is especially available as a reference book in busy seasons. Its use saves time, thought and labor, and ensures quick and satisfactory work.
Monograms are the fad of the time, and there's money for the jeweler in Monogram engraving. The knowledge in this book can be turned into cash. All the various styles of letters are illustrated.
Price, $1.00 (4s. 2d.)
Published byThe Keystone,the organ of the jewelry and optical trades,19th & Brown Sts., Philadelphia, U.S.A.
The Keystone Record Book of Watch Repairs
This book is 9 × 11 inches, has 120 pages, and space for recording sixteen hundred jobs in detail. It is made of linen ledger paper, bound in cloth with leather back and corners.
Price, $1.00 (4s. 2d.), prepaid.
No other record book on the market is so complete, and all cost more.
Published byThe Keystone,the organ of the jewelry and optical trades,19th & Brown Sts., Philadelphia, U.S.A.
The Keystone Book of Guarantees of Watch Repairs
This book contains two hundred printed guarantees, and is handsomely bound. Each guarantee is 3-1/4 x 7-1/2 inches, and most carefully worded. Jewelers have discovered that the use of these guarantees is a most effective way to secure and cultivate public confidence. We sell a book of two hundred for
$1.00 (4s. 2d.), prepaid,
which is one-third less than the price charged by others for a similar book.
Published byThe Keystone,the organ of the jewelry and optical trades,19th & Brown Sts., Philadelphia, U.S.A.