GB872723A - Improvements in or relating to wax projection screens - Google Patents

Improvements in or relating to wax projection screens

Info

Publication number
GB872723A
GB872723A GB3516358A GB3516358A GB872723A GB 872723 A GB872723 A GB 872723A GB 3516358 A GB3516358 A GB 3516358A GB 3516358 A GB3516358 A GB 3516358A GB 872723 A GB872723 A GB 872723A
Authority
GB
United Kingdom
Prior art keywords
wax
oven
glass
glass plates
plates
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
GB3516358A
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 BOVEY
Original Assignee
EDWARD BOVEY
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 BOVEY filed Critical EDWARD BOVEY
Priority to GB3516358A priority Critical patent/GB872723A/en
Publication of GB872723A publication Critical patent/GB872723A/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
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G03B21/60—Projection screens characterised by the nature of the surface
    • G03B21/62—Translucent screens

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Laminated Bodies (AREA)

Abstract

872,723. Laminates. HUNT, P., and BOVEY, E., and BRITISH SCIENTIFIC INSTRUMENT RESEARCH ASSOCIATION. Nov. 3, 1959 [Nov. 3, 1958], No. 35163/58. Class 140. [Also in Group XX] A projection screen comprises two glass plates, polished or rough ground, with an interposed layer of microcrystalline wax of mineral origin. The thickness of the wax layer may be predetermined by means of wire spacers separating the plates. The glass plates are cleaned by conventional methods with a final application of cold water, the surplus being removed as a continuous film by an air jet which chases it across the glass surface. The clean pieces of glass are placed in suitable jigs and the whole placed in an oven together with a quantity of a selected microcrystalline wax of mineral origin in a beaker. The temperature is increased until the wax flows freely, usually about 10‹ C. above its melting point. It is then poured on to one of the glass plates and the other plate is lowered slowly upon it, care being taken to avoid the formation of air bubbles. After the components have been assembled the oven is switched off and the screen allowed to cool naturally whilst still in the oven.
GB3516358A 1958-11-03 1958-11-03 Improvements in or relating to wax projection screens Expired GB872723A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3516358A GB872723A (en) 1958-11-03 1958-11-03 Improvements in or relating to wax projection screens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3516358A GB872723A (en) 1958-11-03 1958-11-03 Improvements in or relating to wax projection screens

Publications (1)

Publication Number Publication Date
GB872723A true GB872723A (en) 1961-07-12

Family

ID=10374568

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3516358A Expired GB872723A (en) 1958-11-03 1958-11-03 Improvements in or relating to wax projection screens

Country Status (1)

Country Link
GB (1) GB872723A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4127683A (en) * 1975-08-20 1978-11-28 Saint-Gobain Industries Method of stacking glass sheets
EP0027287A1 (en) * 1979-10-10 1981-04-22 Cornelis Bos Rear projection screen and method for the production thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4127683A (en) * 1975-08-20 1978-11-28 Saint-Gobain Industries Method of stacking glass sheets
EP0027287A1 (en) * 1979-10-10 1981-04-22 Cornelis Bos Rear projection screen and method for the production thereof
US4375909A (en) 1979-10-10 1983-03-08 Bos C Rear projection screen and method for the production thereof

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