Index
| A | |
| Acid frosting, | 46 |
| “Action” drawings, | 90 |
| Action of a chronometer escapement, | 142 |
| Acting surface of entrance lip, | 127 |
| Actions of cylinder escapement, | 112 |
| Adhesion of parallel surfaces, | 94 |
| Adjustable pallets, | 98 |
| Adjusting screw for drawing instruments, | 21 |
| Analysis of principles involved in detent, | 137 |
| Analysis of the action of a lever escapement, | 86 |
| Angle-measuring device, | 68 |
| Angular extent of shell of cylinder, | 122 |
| Angular motion, drawing an escapement to show, | 91 |
| ----How measured, | 69 |
| ----Of escape wheel, | 37 |
| Antagonistic influences, | 133 |
| Arc of degrees, | 9 |
| Atmospheric disturbances, | 74 |
| Attainment of isochronism, | 159 |
| B | |
| Balance, how it controls timekeeping, | 73 |
| ----Weight and inertia of, | 133 |
| Balance spring, inventor of, | 132 |
| Banking slot of cylinder, | 112 |
| Bankings, effect of opening too wide, | 63 |
| Bar compasses, | 21 |
| Barometric pressure, | 74 |
| Basis for close measurements, | 96 |
| C | |
| Cement chuck, how to use, | 173 |
| Chronometer detent, importance of light construction, | 136 |
| Chronometer escapement, | 131, 155 |
| ----Four principal parts of, | 134 |
| Circular pallets, | 27 |
| Club-tooth escapement, | 30, 34 |
| Club-tooth lever escapement with circular pallets and tangential lockings, | 83 |
| Crown-wheel escapement, | 155 |
| Cylinder, drawing a, | 120 |
| ----Outer diameter of, | 116 |
| ----Putting in a new, | 169 |
| Cylinder escapement, | 155 |
| ----Date of invention, etc., | 111 |
| ----Forms and proportions of several parts of, | 111 |
| ----Names of various parts, | 112 |
| Cylinder lips, proper shape of, | 124 |
| D | |
| Dead-beat escapement, | 131, 135 |
| ----Only one true, | 112 |
| Depth, between cylinder and escape wheel, | 129 |
| ----Effect of changing, | 176 |
| Designing a double roller, | 77 |
| Detached escapement, | 155 |
| Detent, functions of the, | 137 |
| Detent escapement, | 131, 155 |
| ----Faults in, | 132 |
| Detent spring dimensions, | 138 |
| Detent springs, width of, | 147 |
| Discharging jewel, setting the, | 142 |
| Discharging roller, | 136 |
| Dividers, | 9 |
| ----Making, | 10 |
| Double pendulum, | 160 |
| Double-roller escapement, | 75 |
| Draw defined, | 85 |
| Drawing-board, | 11 |
| Drawing instruments, | 9 |
| Drawings, advantage of large, | 29 |
| Drop and draw, | 150 |
| Duplex escapement, | 131, 155 |
| E | |
| Elasticity of spring, | 133 |
| Engaging friction, | 81 |
| English recoil anchor, | 167 |
| Entrance lip of cylinder escapement, | 125 |
| Escapement angles, measuring, | 101 |
| Escapement error, study of, | 64 |
| Escapement matching tool, | 106 |
| Escapement model, | 40 |
| ----Balance, | 42 |
| ----Balance staff, | 44 |
| ----Bridges, | 41, 42 |
| ----Escape wheel, | 43 |
| ----Extra balance cock, | 45 |
| ----“Frosting”, | 46 |
| ----Hairspring, | 42 |
| ----Jewel for, | 43 |
| ----Lower plate, | 41 |
| ----Main plate, | 41 |
| ----Movement for, | 41 |
| ----Pallet staff, | 42 |
| ----Pillars, | 43 |
| ----Regulator, | 46 |
| ----Uses of, | 44 |
| ----Wood base for, | 41 |
| Escapements compared, | 103 |
| Escapement of Dutertre, | 160 |
| Escape-wheel action, | 30 |
| Escape-wheel, delineating an, | 11 |
| Escape-wheel teeth vs. cylinder, | 169 |
| Escape-wheel tooth in action, delineating an, | 126 |
| Exit pallet, | 26 |
| Experiments of Galileo, | 158 |
| Experiments with a chronometer, | 142 |
| Extent of angular impulse, | 118 |
| F | |
| “Fall” defined, | 106 |
| Faults in the detent escapement, | 132 |
| Fixed rules, of little value to student, | 137 |
| Flexure of gold spring, | 146 |
| Foot, fitting up the, | 151 |
| Fork, testing the, | 71 |
| Fork action, | 30 |
| ----Theory of, | 59 |
| Fork and roller action, | 54 |
| Formulas for delineating cylinder escapement, | 115 |
| Frictions, | 24 |
| Frictional escapement, | 131, 132 |
| Frictional surfaces, | 63 |
| Fusee, | 131 |
| G | |
| Gable escapement, | 167 |
| Gage, a new, | 172 |
| Graham anchor escapement, | 155 |
| Gold spring, | 146 |
| Guard point, | 79 |
| ----Material for, | 79 |
| Gummy secretion on impulse and discharging stones, | 147 |
| H | |
| Heights in cylinders, how obtained, | 171 |
| Hole jewels, distance apart, | 140 |
| I | |
| Imaginary faults in cylinders, | 129 |
| Impulse angle, | 118 |
| Impulse arc, extent of, | 134 |
| Impulse jewel set oblique, | 147 |
| Impulse planes, locating outer angle of, | 39 |
| Impulse roller, | 136 |
| Incline of teeth, | 122 |
| Inertia of balance, | 133 |
| Inventions of | |
| ----Berthoud, | 163 |
| ----Béthune, | 165 |
| ----Clement, | 166 |
| ----Dr. Hook, | 162 |
| ----Harrison, | 161 |
| ----Hautefeuille, | 161 |
| ----Huygens, | 158 |
| ----Leroy, | 163 |
| ----Thiout, | 165 |
| J | |
| Jewel pin, determining size, | 58 |
| ----Cementing in, | 67 |
| ----Settings, | 66 |
| Jewel-pin setters, | 67 |
| L | |
| Lathe cement, | 173 |
| ----Removing, | 175 |
| Lever, proper length of, | 61 |
| Lever fork, horn of, | 61 |
| ----prongs of, | 60 |
| Lift, real and apparent, | 112 |
| Lifting angle, | 114 |
| Lock, amount of, | 28 |
| ----Defined, | 85 |
| Lock and drop testing, | 69 |
| Locking jewel, moving the, | 149 |
| Locking stone, good form of, | 144 |
| Lower plate, circular opening in, | 56 |
| M | |
| Marine chronometer, number of beats to hour, | 148 |
| Mathematics, | 95 |
| Measuring tools, | 171 |
| Metal drawings, advantages of, | 140 |
| Motion, how obtained, | 16 |
| Movement holder, | 110 |
| N | |
| Neutral lockings, | 84 |
| O | |
| Original designing, | 148 |
| P | |
| Pallet action, locating the, | 90 |
| Pallet-and-fork action, | 12, 13, 17, 18 |
| Pallet stones, how to set, | 104 |
| Pallets, adjusting to match the fork, | 65 |
| Paper for drawing, | 11 |
| Parts, relations of the, | 32 |
| Passing hollow, | 62 |
| Perfected lever escapement, | 87 |
| Pivots, turning, | 172 |
| Point of percussion, | 139 |
| Points for drawing instruments, | 20 |
| Polishing materials, | 52 |
| Power leaks, | 16 |
| Power lost in lever escapement, | 87 |
| Practical problems in the lever escapement, | 98 |
| R | |
| Radial extent of outside of cylinder, | 125 |
| Ratchet-tooth escape wheel, | 12 |
| Recoil anchor escapement, | 155 |
| Recoil escapement, | 154 |
| Reduced gable escapement, | 167 |
| Retrograde motion, | 36 |
| Roller action, why 30 degrees, | 55 |
| ----Of double roller, | 78 |
| Roller diameter, determining the, | 55 |
| Ruling pen, | 9 |
| S | |
| Safety action, | 56 |
| Scale of inches, | 9 |
| Screws, making extra large, | 45 |
| Screwheads, fancy, | 45 |
| Selecting new cylinder, | 170 |
| Shaping, advantages gained in, | 116 |
| Sheet steel, cutting, | 48 |
| Short fork, | 100 |
| Sound as indicator of correct action, | 144 |
| Spring, elasticity of, | 133 |
| Staking on a balance, | 175 |
| Steel, polishing, | 49 |
| ----Tempering, | 49 |
| Study drawings, | 124 |
| Systems of measurements, | 114 |
| T | |
| Tangential lockings, | 80, 148 |
| Test gage for angular movement, | 65 |
| Theoretical action of double roller, | 76 |
| Timekeeping, controlled by balance, | 73 |
| Tool for length measurement, | 174 |
| Tools, measuring, | 171 |
| Triangle, | 18 |
| T-square, | 9 |
| U | |
| Unlocking action, | 56 |
| Unlocking roller, | 136 |
| V | |
| Verge escapement, | 131, 155 |
| W | |
| Weight and inertia of balance, | 133 |
| Working model of cylinder escapement, | 123 |
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.
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.
THE KEYSTONE PORTFOLIO OF 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.)
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:
| Chapter I. | —Introductory Remarks. |
| Chapter II. | —The Eye Anatomically. |
| Chapter III. | —The Eye Optically; or, The Physiology of Vision. |
| Chapter IV. | —Optics. |
| Chapter V. | —Lenses. |
| Chapter VI. | —Numbering of Lenses. |
| Chapter VII. | —The Use and Value of Glasses. |
| Chapter VIII. | —Outfit Required. |
| Chapter IX. | —Method of Examination. |
| Chapter X. | —Presbyopia. |
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.
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.
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Bound in Cloth—408 pages—with illustrations.
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.
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.
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).