GB330101A - Optical means for locating a source of illumination - Google Patents

Optical means for locating a source of illumination

Info

Publication number
GB330101A
GB330101A GB1408529A GB1408529A GB330101A GB 330101 A GB330101 A GB 330101A GB 1408529 A GB1408529 A GB 1408529A GB 1408529 A GB1408529 A GB 1408529A GB 330101 A GB330101 A GB 330101A
Authority
GB
United Kingdom
Prior art keywords
lens
screen
respect
source
images
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
Application number
GB1408529A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EDWARD ALLEN EVERETT
Original Assignee
EDWARD ALLEN EVERETT
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by EDWARD ALLEN EVERETT filed Critical EDWARD ALLEN EVERETT
Priority to GB1408529A priority Critical patent/GB330101A/en
Publication of GB330101A publication Critical patent/GB330101A/en
Expired legal-status Critical Current

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
    • G03B21/14—Details
    • G03B21/145—Housing details, e.g. position adjustments thereof
    • 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
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/2046—Positional adjustment of light sources

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Microscoopes, Condenser (AREA)

Abstract

330,101. Everett, E. A. May 6, 1929. Optical apparatus. -. A sighting device for locating a light source 11 at a point comprises a lens 12, provided with a diaphragm 13 having apertures 15 at equal distances from its centre and a screen 14 on which the lens and diaphragm form images of the light source 11. When source 11 is at a point conjugate to screen 14 with respect to lens 13 the images formed by the pencils passing through the apertures coincide and are symmetrical with respect to axis x-x. For other positions of source 11 the various apertures produce separate, images offset with respect to axis x-x. The lens 12 may be replaced by prisms of suitable angle placed at each aperture. Fig. 3 shows the apparatus being used to adjust the filament 11 of bulb 33 at the focus of a projecting lens 26. The focal point of lens 26 is arranged to be conjugate to screen 14 with respect to lens 12 and bulb 33 is adjusted on its mounting until the images on screen 14 coincide.
GB1408529A 1929-05-06 1929-05-06 Optical means for locating a source of illumination Expired GB330101A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1408529A GB330101A (en) 1929-05-06 1929-05-06 Optical means for locating a source of illumination

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1408529A GB330101A (en) 1929-05-06 1929-05-06 Optical means for locating a source of illumination

Publications (1)

Publication Number Publication Date
GB330101A true GB330101A (en) 1930-06-05

Family

ID=10034707

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1408529A Expired GB330101A (en) 1929-05-06 1929-05-06 Optical means for locating a source of illumination

Country Status (1)

Country Link
GB (1) GB330101A (en)

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