GB430508A - Improvements in or relating to optical copying apparatus - Google Patents

Improvements in or relating to optical copying apparatus

Info

Publication number
GB430508A
GB430508A GB70734A GB70734A GB430508A GB 430508 A GB430508 A GB 430508A GB 70734 A GB70734 A GB 70734A GB 70734 A GB70734 A GB 70734A GB 430508 A GB430508 A GB 430508A
Authority
GB
United Kingdom
Prior art keywords
sheet
aperture
reflector
drawing surface
members
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
GB70734A
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.)
JOHN MOORE SCOTT SOTHERN
Original Assignee
JOHN MOORE SCOTT SOTHERN
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 JOHN MOORE SCOTT SOTHERN filed Critical JOHN MOORE SCOTT SOTHERN
Priority to GB70734A priority Critical patent/GB430508A/en
Publication of GB430508A publication Critical patent/GB430508A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/14—Beam splitting or combining systems operating by reflection only
    • G02B27/144—Beam splitting or combining systems operating by reflection only using partially transparent surfaces without spectral selectivity

Abstract

430,508. Camera lucidas. SOTHERN, J. M. S., 115, Falmouth Road, New Kent Road, London. Jan. 8, 1934, No. 707. [Class 97 (i)] Apparatus for copying drawings &c. comprises a reflector 2 and a transparent glass sheet 3 at an angle to the reflector, the members 2, 3 being enclosed in a casing 4 of substantially prismatic form having a viewing aperture 5 within the angle between the members 2, 3. The hypotenuse face of the casing supporting the sheet 3 is open and is directed towards the object to be copied. Part of the light from the object passes through the sheet 3 to the reflector 2 and is directed back to the sheet 3 by which it is partly reflected towards the aperture 5 so that a virtual image is seen on a drawing surface placed below the apparatus. A sheet 7 of light-absorbent material such as coloured or darkened glass may be provided between the aperture 5 and the drawing surface. A lens may be provided in the aperture. The apparatus is carried by a support at a convenient height above the drawing surface.
GB70734A 1934-01-08 1934-01-08 Improvements in or relating to optical copying apparatus Expired GB430508A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB70734A GB430508A (en) 1934-01-08 1934-01-08 Improvements in or relating to optical copying apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB70734A GB430508A (en) 1934-01-08 1934-01-08 Improvements in or relating to optical copying apparatus

Publications (1)

Publication Number Publication Date
GB430508A true GB430508A (en) 1935-06-20

Family

ID=9709134

Family Applications (1)

Application Number Title Priority Date Filing Date
GB70734A Expired GB430508A (en) 1934-01-08 1934-01-08 Improvements in or relating to optical copying apparatus

Country Status (1)

Country Link
GB (1) GB430508A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3227043A (en) * 1962-08-30 1966-01-04 Ernest J Swimmer Camera lucida drawing instrument with intensity control
GB2454522A (en) * 2007-11-10 2009-05-13 Roy Malcolm Simmons Improved Camera Lucida

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3227043A (en) * 1962-08-30 1966-01-04 Ernest J Swimmer Camera lucida drawing instrument with intensity control
GB2454522A (en) * 2007-11-10 2009-05-13 Roy Malcolm Simmons Improved Camera Lucida

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