قراءة كتاب Photogravure
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the leisure hours, after practical service during the day in a photo-engraving establishment, so that the instruction goes directly from the shop to the pupil. It has been the author's hope, in writing this book, to so carefully describe every branch of work connected with the subject, that the beginner, who knows absolutely nothing about it, may become a practical photo-engraver from a careful reading of the work.
CONTENTS:
Chapter I.—Drawings for Photographic Reproduction. The Materials Required.
Chapter II.—Chemicals used in Photo-Engraving.
Chapter III.—Apparatus and the Workshop.
Chapter IV.—Photographic Processes as Employed in Photo-Engravings. Preparation of the Chemicals.
Chapter V.—Causes of Failure. Remedies.
Chapter VI.—The Half-Tone Process. Screen Plates.
Chapter VII.—Zinc Etching. Preparation of Chemicals Used in Zinc Etching.
Chapter VIII.—Etching in Half-Tone.
Chapter IX.—Blocking and Finishing. Tools and Materials.
Chapter X.—Swelled Gelatine Process of Photo-Engraving.
Chapter XI.—Lithotype Engraving for Color Work.
Chapter XII.—Photographing on Wood and Other Processes.
Price, in paper covers $2 00
" cloth bound (Library Edition) 2 50
For sale by all dealers in Photographic Materials, and sent, post-paid, on receipt of price, by the publishers,
THE SCOVILL & ADAMS COMPANY,
423 Broome Street, New York City.
E. EDWARDS PHOTO. N.Y PHOTOGRAVURE CO.
A Roadside Cottage in the Catskills
PHOTOGRAVURE.
BY
HENRY R. BLANEY.
With Introduction and Additions by the Editor.
NEW YORK:
THE SCOVILL & ADAMS COMPANY.
1895.
Copyright, 1895,
The Scovill & Adams Company.
CONTENTS.
| PAGE | |
| Introduction by the Editor.—Early History of Photogravure—Woodbury's Process—Other Methods, | 5 |
| Chapter I.—The Negative.—Quality best Suitable.—Necessity for Reversing.—Methods of Obtaining Reversals.—The Powder Process, | 9 |
| Chapter II.—The Transparency.—The Carbon Process.—Cutting up the Tissue.—Sensitizing.—Drying.—Exposing.—Continuing Action of Light.—Development.—Carbutt's Transparency Plates, | 15 |
| Chapter III.—The Carbon Tissue.—Sensitizing and Exposing.—The Actinometer, | 22 |
| Chapter IV.—Cleaning and Graining of the Copper Plate Plate—Grade of Copper Necessary.—Where and How to Buy it, | 25 |
| Chapter V.—Development of Negative Resist on the Copper Plate.—Preparation for Biting with Acid through the Gelatine, | 29 |
| Chapter VI.—The Acid Baths.—How to Make Them and Method of Biting through the Gelatine, | 32 |
| Chapter VII.—Cleaning and Polishing the Plate, with Tools Necessary for Retouching, | 37 |
| Chapter VIII.—Printing from the Plate.—Steel Facing, | 39 |
| Chapter IX.—Materials Necessary for Photogravure—List of Firms Supplying Them, | 41 |
| Chapter X.—Books and Articles on Photogravure, 1888-1893, | 44 |
INTRODUCTION.
About the year 1820 Nicéphore Niepce made the discovery that bitumen, under certain conditions, was sensitive to light. He dissolved it in oil of lavender, and spread a thin layer of the solution thus obtained upon stone. This he exposed under a drawing (making the paper transparent by waxing), and after sufficient exposure, oil of lavender was poured on. Those portions of the bitumen which had been exposed to the action of the light had become insoluble, and so remained while the lines which had been protected by the drawing were dissolved away. By treating the stone with an acid these lines were bitten or eroded, and could be printed from. Niepce afterward employed metal plates instead of the stone.
Here we have the foundation for a number of printing processes of the present day, including photogravure.
For many years, however, progress in processes for intaglio printing was very slow. In 1852
