US859342A - Process for making half-tone engravings for use in lithography. - Google Patents
Process for making half-tone engravings for use in lithography. Download PDFInfo
- Publication number
- US859342A US859342A US20656304A US1904206563A US859342A US 859342 A US859342 A US 859342A US 20656304 A US20656304 A US 20656304A US 1904206563 A US1904206563 A US 1904206563A US 859342 A US859342 A US 859342A
- Authority
- US
- United States
- Prior art keywords
- lithography
- negative
- positive
- making
- engravings
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000000034 method Methods 0.000 title description 9
- 238000001459 lithography Methods 0.000 title description 3
- 239000004575 stone Substances 0.000 description 4
- 238000005530 etching Methods 0.000 description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 239000004411 aluminium Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 108010010803 Gelatin Proteins 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000009414 blockwork Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229920000159 gelatin Polymers 0.000 description 1
- 239000008273 gelatin Substances 0.000 description 1
- 235000019322 gelatine Nutrition 0.000 description 1
- 235000011852 gelatine desserts Nutrition 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F5/00—Screening processes; Screens therefor
- G03F5/20—Screening processes; Screens therefor using screens for gravure printing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S430/00—Radiation imagery chemistry: process, composition, or product thereof
- Y10S430/152—Making camera copy, e.g. mechanical negative
Definitions
- This invention relates to a process for making en-' gravings, for use in connection with lithography.
- the process of making such engravings at present in use consists in photographing the matter through a shades,
- This block consists of a large number of dots in relief, which when the block is printed from, appear all over the print.
- the method employed consists in first taking a photograph of the desired matter.
- the negative then produced, if the original matter consists of a wash drawing or photograph, is photographed by means of a camera through the screen, so that a positive in half tone is produced.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Printing Plates And Materials Therefor (AREA)
- Manufacture Or Reproduction Of Printing Formes (AREA)
Description
. UNITED STATES PA ENT: OFFICE.
FREDERICK WILLIAM SEARS, OFWELL'INGTON, NEW ZEALAND.
PROCESS FQR MAKING HALF-TONE ENG-RAVIN GS FOR USE IN LITHOGRAPHY- Specification of Letters Patent.
Patented ul 9, 1907.
Application filed May 6, 1904. Serial No- 206,563.
This invention relates to a process for making en-' gravings, for use in connection with lithography. The process of making such engravings at present in use, consists in photographing the matter through a shades,
screen, and, from the negative so obtained, making the desired block. This block consists of a large number of dots in relief, which when the block is printed from, appear all over the print.
This process, however, has been designed in order to get rid of the dots on the white places and to regulate the sizes of the dots on the remaining portions so that the largest shall be upon the solid black,ground and they shall gradually diminish in size on to the lighter merging themselves into the actual white. The printed matter will thus be sharply defined and will be more effectually shaded than with the ordinary process. l
The method employed consists in first taking a photograph of the desired matter. The negative then produced, if the original matter consists of a wash drawing or photograph, is photographed by means of a camera through the screen, so that a positive in half tone is produced. In the making of the half tone positive the dark portions of the first negative,-
or those portions which are light in the original, will nullify the effect of the screen so that in the positive obtained, the white spaces will be clear of the screen, while those parts which are lightest in the negative will be blackest in the positive. The intermediate shadings will show out the screen dots according to their different densities. From the half tone positive thus obtained, which will be. in itself a true reproduction of the shadesof the original, a contact negative is made in the ordinary manner, that is, by
laying the positive upon a sensitized medium spread evenly over the surface of a plate and exposing the same to the light and then developing. An etching fluid is then spread over the. plate and allowed to etch same to a slight depth. The result obtained is an intaglio half tone plate or stone and is ready for the lithographer to fill in with ink and print in the usual lithographic manner.
When it is desired to workthe matter on to the surface of a stone or aluminium or zinc plate, the positive is placed in contact with a dry gelatin of collodion plate, and the result is a high light negative. This negative when placed in contact with a sensitized aluminium or zinc plate or stone, exposed to the light in the usual manner and developed is ready for the lithographer without any necessity for fine etching. Upon the other hand'the difliculty of re- -moving the screening can be readily effected in block work by what is known as fine etching which consists in eating the dots away locally with acid. Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is: I
1. The improved process for making half tone engravings for use in lithography and other printing, such process consisting in first photographing the desired matter, then photographing the negative thus obtained through a screen so as to produce a half tone positive with pure high lights and then printing from such positive on to a metal plate or stone in the usual manner.
2. The improved process of making half tone engravings which consists in first photographing the desired matter, then photographing the negative thus obtained through a screen to produce a half tone positive with pure high lights, then obtaining a contact negative from such positive, and then printing from such negative on a lithographic surface, substantially as described.
In testimony whereof, I have signed this specification inthe presence of two subscribing witnesses.
FREDERICK WILLIAM SEARS.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US20656304A US859342A (en) | 1904-05-05 | 1904-05-05 | Process for making half-tone engravings for use in lithography. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US20656304A US859342A (en) | 1904-05-05 | 1904-05-05 | Process for making half-tone engravings for use in lithography. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US859342A true US859342A (en) | 1907-07-09 |
Family
ID=2927795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US20656304A Expired - Lifetime US859342A (en) | 1904-05-05 | 1904-05-05 | Process for making half-tone engravings for use in lithography. |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US859342A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2440102A (en) * | 1944-05-31 | 1948-04-20 | Polaroid Corp | Process of manufacture of light polarizing two tone image on a sheet |
-
1904
- 1904-05-05 US US20656304A patent/US859342A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2440102A (en) * | 1944-05-31 | 1948-04-20 | Polaroid Corp | Process of manufacture of light polarizing two tone image on a sheet |
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