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Common terms and phrases12 leaves 80 teeth angle axis balance wheel barrel body calculation cannon pinion center wheel chronometer coils consequently curve cycloid cylinder determine dial diminish distance division drives elasticity elongation epicycloid equal equation equilibrium escape wheel example exterior gearing fibre flank gearings formula fourth wheel friction fusee give hand horology hour interior JEWELRY AND OPTICAL length Let us remark line of centers Marine chronometers mechanical meridian mobiles motion motive force movement normal number of leaves number of oscillations number of teeth number of turns obtain ogive pendulum pinion leaf pitch pivots plane point of contact position preceding primitive circle primitive circumferences primitive radius produced pulley radii radius of curvature relation resistance rotation sidereal day solar day spring straight line surface tang tangent teeth gearing teeth range third wheel tion tooth total radius traversed watch weight whence Popular passagesPage 277 - Dioptric Formulae for Combined Cylindrical Lenses, The Prism-Dioptry and Other Original Papers By CHARLES F. PRENTICE, ME 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 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... Page 277 - 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. Page 279 - 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... Page 277 - 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. Page 275 - Professor of Ophthalmology and Otology in the Georgetown University Medical School; Director of the Eye and Ear Clinic, Central Dispensary and Emergency Hospital ; Ophthalmologist to the Children's Hospital and to Providence Hospital, etc., Washington, DC IN this treatise the student... Page 277 - ... volume. In this revised form, with the addition of recent research these standard papers are of increased value. Combined 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 Formulae 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. Page 12 - In moving round the sun, the axis of the earth is not perpendicular to the plane of its orbit. Page 279 - ... Record-Book of Optometric Examinations AECORD-BOOK, wherein to record optometric examinations, is an indispensable adjunct to an optometrist's outfit. The Keystone Record-Book of Optometric Examinations 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... Page 276 - 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. Page 277 - 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. Bibliographic information
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