GB894081A - An improved technique and means for rendering printed information invisible - Google Patents

An improved technique and means for rendering printed information invisible

Info

Publication number
GB894081A
GB894081A GB11810/58A GB1181058A GB894081A GB 894081 A GB894081 A GB 894081A GB 11810/58 A GB11810/58 A GB 11810/58A GB 1181058 A GB1181058 A GB 1181058A GB 894081 A GB894081 A GB 894081A
Authority
GB
United Kingdom
Prior art keywords
answer
navigation
concealed
computation
revealed
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
GB11810/58A
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.)
Valkenburgh Nooger & Neville I
Original Assignee
Valkenburgh Nooger & Neville I
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 Valkenburgh Nooger & Neville I filed Critical Valkenburgh Nooger & Neville I
Publication of GB894081A publication Critical patent/GB894081A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B3/00—Manually or mechanically operated teaching appliances working with questions and answers
    • G09B3/02—Manually or mechanically operated teaching appliances working with questions and answers of the type wherein the student is expected to construct an answer to the question which is presented or wherein the machine gives an answer to the question presented by a student
    • G09B3/04—Manually or mechanically operated teaching appliances working with questions and answers of the type wherein the student is expected to construct an answer to the question which is presented or wherein the machine gives an answer to the question presented by a student of chart form

Landscapes

  • Engineering & Computer Science (AREA)
  • Business, Economics & Management (AREA)
  • Physics & Mathematics (AREA)
  • Educational Administration (AREA)
  • Educational Technology (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Electrically Operated Instructional Devices (AREA)

Abstract

894,081. Educational appliances. VAN VALKENBURGH, NOOGER & NEVILLE Inc. April 14, 1958 [Feb. 26, 1958], No. 11810/58. Addition to 851,749 Class 146(2) [Also in Group XVI] The invention of the parent Specification is modified in that the printed matter which is to be concealed is made further difficult to see by printing information in a pattern comprising discrete areas separated by interstices. The apparatus is described in connection with the teaching the understanding of electronic equipment and celestial navigation. In the former an electronic amplifier has developed a fault 21 and the points in the amplifier at which the student investigates are recorded by a number to the right of a sectionally erased or removed part of screens 22-29 which initially cover the printed matter. By showing the sequence of steps he has taken to find the solution, the student shows, not only the answer, but also the manner in which he developed it. For teaching navigation a self-instruction problem simulator comprises a series of questions, the answers to which are concealed. Upon computation of say groundspeed and true heading, see step 2, Fig. 8, an answer is revealed. If computation has been incorrect the answer revealed will give a minus sign or code, e.g. as at 42, 43, 44 and further computations are made until correct answer is found, e.g. 41. Similar steps 3-13 are used to reveal visible response information supplied to the user as he proceeds to compute each of the stages of the problem. Step 14 includes calculations using other navigation equipment and after totalling the number of erasures made, a score is read off on a chart 45. Specifications 851,936 and 858,194 also are referred to.
GB11810/58A 1958-02-26 1958-04-14 An improved technique and means for rendering printed information invisible Expired GB894081A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US894081XA 1958-02-26 1958-02-26

Publications (1)

Publication Number Publication Date
GB894081A true GB894081A (en) 1962-04-18

Family

ID=22217473

Family Applications (1)

Application Number Title Priority Date Filing Date
GB11810/58A Expired GB894081A (en) 1958-02-26 1958-04-14 An improved technique and means for rendering printed information invisible

Country Status (1)

Country Link
GB (1) GB894081A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2171054A (en) * 1985-02-08 1986-08-20 Norton & Wright Limited Question-and-answer cards
WO1991018376A1 (en) * 1990-05-22 1991-11-28 Gilles Burstin Processes and products for generating documents with inherent confidentiality
US6220633B1 (en) 1997-11-07 2001-04-24 Documotion Research Inc. Tamper-evident form for securely carrying information
US6481753B2 (en) 1998-10-30 2002-11-19 Documotion Research, Inc. Form for concealing variable printed information
EP1680285A2 (en) * 2003-11-04 2006-07-19 De La Rue International Limited Security device
EP1054778B1 (en) 1998-01-15 2009-07-29 Securency International Pty Ltd Security document having visually concealed security indicia

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2171054A (en) * 1985-02-08 1986-08-20 Norton & Wright Limited Question-and-answer cards
GB2171054B (en) * 1985-02-08 1989-08-02 Norton & Wright Limited Improvements relating to printed material
WO1991018376A1 (en) * 1990-05-22 1991-11-28 Gilles Burstin Processes and products for generating documents with inherent confidentiality
FR2662530A1 (en) * 1990-05-22 1991-11-29 Burstin Gilles METHOD AND PRODUCTS FOR THE GENERATION OF INTRINSICALLY CONFIDENTIALITY DOCUMENTS.
US6220633B1 (en) 1997-11-07 2001-04-24 Documotion Research Inc. Tamper-evident form for securely carrying information
US6231082B1 (en) 1997-11-07 2001-05-15 Documotion Research, Inc. Tamper-evident form for securely carrying information
EP1054778B1 (en) 1998-01-15 2009-07-29 Securency International Pty Ltd Security document having visually concealed security indicia
US6481753B2 (en) 1998-10-30 2002-11-19 Documotion Research, Inc. Form for concealing variable printed information
EP1680285A2 (en) * 2003-11-04 2006-07-19 De La Rue International Limited Security device
US7997625B2 (en) 2003-11-04 2011-08-16 De La Ru International Limited Security device
EP1680285B1 (en) * 2003-11-04 2015-04-01 De La Rue International Limited Security device

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