DE350850C - Process of transforming documents into secret documents through photographic reproduction - Google Patents
Process of transforming documents into secret documents through photographic reproductionInfo
- Publication number
- DE350850C DE350850C DENDAT350850D DE350850DD DE350850C DE 350850 C DE350850 C DE 350850C DE NDAT350850 D DENDAT350850 D DE NDAT350850D DE 350850D D DE350850D D DE 350850DD DE 350850 C DE350850 C DE 350850C
- Authority
- DE
- Germany
- Prior art keywords
- documents
- photographic reproduction
- document
- secret
- transforming
- 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
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
- G03C5/08—Photoprinting; Processes and means for preventing photoprinting
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Light Sources And Details Of Projection-Printing Devices (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
Description
Gegenstand der Erfindung ist ein Verfahreai, Schriftstücke durch photographische Reproduktion in geheime zu verwandeln.The subject of the invention is a process To transform documents into secret through photographic reproduction.
Das Schriftstück wird bei der Reproduktion unter eine mit Aussparungen versehene Schablone gelegt, so daß nur ein Teil der Schrift durch die Aussparungen hindurch sichtbar ist. Die Schablone kann auf dem· Schriftstück ruckweise verschoben werden, soWhen reproducing, the document is placed under a cut-out Stencil placed so that only part of the font through the recesses is visible. The template can be moved jerkily on the document, see above
ίο daß bei jeder Aufnahme neue Teile des Schriftstücks reproduziert werden. Zu diesem Zweck ist die Schablone, wie die Abbildung zeigt, an den Führungsschienen α1, α2 verschiebbar. Die Führungsschienen tragen Teilstriche r, 2, 3, 4 usw., auf die die Nasen ö1, b2 scharf eingestellt wenden. Bei der ersten Aufnahme stehen die Nasen auf dem Teilstrich i, bei der zweiten Aufnahme auf dem Teilstrich 2 usw. Es werden auf diese Weise mehrere gesonderte Aufnahmen und zwar so viele, daß alle Teile des Schriftstücks abgebildet werden, auf Bromsilberpapier hergestellt. Die Schablone ist weiß gefärbt, so daß das von ihr zurückgeworfene Licht das Bromsillberpapier schwarz färbt, also auf das Bromsilberpapier genau, so einwirkt, wie das Schriftstück selbst nach stellenweiser Entfernung der schwarzen Schriftzüge einwirken würde. Die einzelnen Kopien können getrennt aufbewahrt, versandt und durch einen photographischen Reproduktionsapparat wieder vereinigt werden. Dies geschieht dadurch, daß sie nacheinander und in der ursprünglichem Stellung auf ein und dasselbe Blatt Bromsilberpapier kopiert werden. Die schwärzen. schriftlosen Stellen der Teilkopien verr Ursachen keine photochemische Einwirkungauf das lichtempfindliche Papier, so daß das Papier trotz mehrfacher- Belichtung an diesen Stellen weiß bleibt, und --nur=-die weißen Schriftzüge sich abbilden.ίο that new parts of the document are reproduced with each recording. For this purpose, the template, as shown in the figure, can be moved along the guide rails α 1 , α 2 . The guide rails have graduation marks r, 2, 3, 4, etc., on which the noses ö 1 , b 2 turn in focus. In the first shot, the noses are on graduation i, in the second shot on graduation 2, etc. In this way, several separate images are made on bromide silver paper, so many that all parts of the document are depicted. The stencil is colored white so that the light thrown back from it colors the bromide silver paper black, i.e. acts on the bromide silver paper exactly as the document itself would act after removing the black lettering in places. The individual copies can be stored separately, sent and reunited by a photographic reproduction machine. This is done by copying them one after the other and in their original position onto one and the same sheet of bromide-silver paper. They blacken. illiterate points of the partial copies ver r causes no photochemical Einwirkungauf the light-sensitive paper so that the paper despite mehrfacher- exposure at these locations will remain white, and --only = -the white lettering be mapped.
Die Schablone kann statt über dem Schriftstück auch vor dem Bildfeld in der Kamera angebracht werden.The template can also be placed in front of the image field in the camera instead of over the document be attached.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE350850T |
Publications (1)
Publication Number | Publication Date |
---|---|
DE350850C true DE350850C (en) | 1922-03-27 |
Family
ID=6264756
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DENDAT350850D Expired DE350850C (en) | Process of transforming documents into secret documents through photographic reproduction |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE350850C (en) |
-
0
- DE DENDAT350850D patent/DE350850C/en not_active Expired
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