GB414164A - Improvements in or relating to apparatus for the photographic reproduction of drawings and the like - Google Patents
Improvements in or relating to apparatus for the photographic reproduction of drawings and the likeInfo
- Publication number
- GB414164A GB414164A GB726033A GB726033A GB414164A GB 414164 A GB414164 A GB 414164A GB 726033 A GB726033 A GB 726033A GB 726033 A GB726033 A GB 726033A GB 414164 A GB414164 A GB 414164A
- Authority
- GB
- United Kingdom
- Prior art keywords
- screen
- casing
- frame
- barron
- drawings
- 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
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B27/00—Photographic printing apparatus
- G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
- G03B27/52—Details
- G03B27/54—Lamp housings; Illuminating means
- G03B27/545—Lamp housings; Illuminating means for enlargers
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Illuminated Signs And Luminous Advertising (AREA)
Abstract
414,164. Illuminating translucent drawings. BARRON, C. A., and BARRON, H. D., Eldon Street Works, Preston. March 10, 1933, No. 7260. Addition to 380,930, [Group XX]. [Class 3 (ii).] The casing described in the parent Specification is modified by interposing between the source of light and the transparent panel which supports the drawing, a diffusing screen, the thickness or density of which diminishes towards the edges so as to produce an even illumination over the whole surface of the drawing. The electric lamps in the casing may be so disposed that no direct light falls on the screen. In the form shown, the casing a is closed at the front by a ground glass screen b in front of which is mounted a frame c for holding the drawing. To facilitate centering the latter, faint lines may be marked on the screen b. Between the lamps d and the screen b, an adjustable screen e is mounted having a series of translucent patches e<1>-e<4>, Fig. 3, of increasing density. In place of using the faint lines on the screen b, a separate frame having horizontal and vertical wires stretched across it, may be suspended in front of the frame c.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB726033A GB414164A (en) | 1933-03-10 | 1933-03-10 | Improvements in or relating to apparatus for the photographic reproduction of drawings and the like |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB726033A GB414164A (en) | 1933-03-10 | 1933-03-10 | Improvements in or relating to apparatus for the photographic reproduction of drawings and the like |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB414164A true GB414164A (en) | 1934-08-02 |
Family
ID=9829689
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB726033A Expired GB414164A (en) | 1933-03-10 | 1933-03-10 | Improvements in or relating to apparatus for the photographic reproduction of drawings and the like |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB414164A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2514158A1 (en) * | 1981-10-05 | 1983-04-08 | Itek Corp | REAR LIGHT COPYING PANEL HAVING AN ORIGINAL LIGHT ATTENUATOR |
-
1933
- 1933-03-10 GB GB726033A patent/GB414164A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2514158A1 (en) * | 1981-10-05 | 1983-04-08 | Itek Corp | REAR LIGHT COPYING PANEL HAVING AN ORIGINAL LIGHT ATTENUATOR |
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