GB559971A - Improvements in or relating to illuminating devices for episcopic projection apparatus - Google Patents
Improvements in or relating to illuminating devices for episcopic projection apparatusInfo
- Publication number
- GB559971A GB559971A GB12764/42A GB1276442A GB559971A GB 559971 A GB559971 A GB 559971A GB 12764/42 A GB12764/42 A GB 12764/42A GB 1276442 A GB1276442 A GB 1276442A GB 559971 A GB559971 A GB 559971A
- Authority
- GB
- United Kingdom
- Prior art keywords
- projection apparatus
- plate
- mirrors
- illumination
- inclination
- 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
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/06—Projectors or projection-type viewers; Accessories therefor affording only episcopic projection
Abstract
559,971. Optical-projection apparatus. SOC. GENEVOISE D'INSTRUMENTS DE PHYSIQUE. Sept. 10, 1942, No. 12764. Convention date, Jan. 28. [Class 97 (i)] In episcopic projection apparatus, means for producing perpendicular illumination of the object, and means producing oblique illumination of the object, are so mounted that either may be brought into operative position. As shown in vertical section in Fig. 2, and in plan in Fig. 4, a semi-transparent plate 6 and mirrors 7, 8 are mounted on a slide 9 movable rectilinearly on a collar 18, carried by the tube 2 around an objective 1, to bring either the plate or mirrors into position beneath an object 4 on a table 3. The plate 6 is adjustable in inclination to reflect a parallel beam from an external source perpendicularly on to the surface of the object 4. The mirrors 7, 8 are adjustable towards and from one another, and in inclination, to effect light ground or dark ground illumination by a beam from the external source, details of construction of such means, and of stops for limiting the movements, being described. A modification is described in which the slide 9 is replaced by a plate rotatable about a spindle having its axis parallel to the optical axis of the objective.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH559971X | 1942-01-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB559971A true GB559971A (en) | 1944-03-14 |
Family
ID=4520218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB12764/42A Expired GB559971A (en) | 1942-01-28 | 1942-09-10 | Improvements in or relating to illuminating devices for episcopic projection apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB559971A (en) |
-
1942
- 1942-09-10 GB GB12764/42A patent/GB559971A/en not_active Expired
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