GB451710A - Improvements relating to photographic projection printing apparatus - Google Patents
Improvements relating to photographic projection printing apparatusInfo
- Publication number
- GB451710A GB451710A GB998935A GB998935A GB451710A GB 451710 A GB451710 A GB 451710A GB 998935 A GB998935 A GB 998935A GB 998935 A GB998935 A GB 998935A GB 451710 A GB451710 A GB 451710A
- Authority
- GB
- United Kingdom
- Prior art keywords
- holder
- prism
- lamp
- faces
- lid
- 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
- G03B27/542—Lamp housings; Illuminating means for copying cameras, reflex exposure lighting
Abstract
451,710. Photographic projectionprinting apparatus. WALSH, H., 55, Redditch Road, and WILSON, A. A., 220, Heath Road, both in KingsNorton.Birmingham. March 30, 1935, No. 9989. [Class 98 (i)] The apparatus comprises a lamp g illuminating an opaque negative or object in a holder d, and a double reflecting prism a or equivalent arranged between the holder and a lens e and adapted to pro duce at least two deflections of the image - forming bean before it is projected by lens e on to the holder f of the sensitive sheet. The longitudinal axis of the lamphouse h may be inclined at 75‹ to one of the parallel prism faces b, and may have a diffusing plate k. The holder d rests against one of the parallel prism faces c, which are inclined at 45‹ to the faces b, and has a hinged pressure-lid which may control as through a rod j a pivoted mercury switch i in the lamp circuit to switch on the lamp only when the lid is closed. The prism a may be in one piece or may consist of two parts contiguous along the dotted line; it may be replaced by a hollow prism filled with liquid, or by a pair of inclined reflecting plates of which at least one is transparent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB998935A GB451710A (en) | 1935-03-30 | 1935-03-30 | Improvements relating to photographic projection printing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB998935A GB451710A (en) | 1935-03-30 | 1935-03-30 | Improvements relating to photographic projection printing apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB451710A true GB451710A (en) | 1936-08-11 |
Family
ID=9882485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB998935A Expired GB451710A (en) | 1935-03-30 | 1935-03-30 | Improvements relating to photographic projection printing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB451710A (en) |
-
1935
- 1935-03-30 GB GB998935A patent/GB451710A/en not_active Expired
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