GB348069A - An improved device for use in connection with codes - Google Patents
An improved device for use in connection with codesInfo
- Publication number
- GB348069A GB348069A GB382130A GB382130A GB348069A GB 348069 A GB348069 A GB 348069A GB 382130 A GB382130 A GB 382130A GB 382130 A GB382130 A GB 382130A GB 348069 A GB348069 A GB 348069A
- Authority
- GB
- United Kingdom
- Prior art keywords
- strips
- frame
- code
- symbols
- signs
- 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
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09C—CIPHERING OR DECIPHERING APPARATUS FOR CRYPTOGRAPHIC OR OTHER PURPOSES INVOLVING THE NEED FOR SECRECY
- G09C1/00—Apparatus or methods whereby a given sequence of signs, e.g. an intelligible text, is transformed into an unintelligible sequence of signs by transposing the signs or groups of signs or by replacing them by others according to a predetermined system
- G09C1/04—Apparatus or methods whereby a given sequence of signs, e.g. an intelligible text, is transformed into an unintelligible sequence of signs by transposing the signs or groups of signs or by replacing them by others according to a predetermined system with sign carriers or indicators moved relative to one another to positions determined by a permutation code, or key, so as to indicate the appropriate corresponding clear or ciphered text
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Purses, Travelling Bags, Baskets, Or Suitcases (AREA)
Abstract
348,069. Coding-devices. SUNDERLAND, C. and MEGSON, C. R., 11, Queen Victoria Street, London. Feb. 4, 1930, No. 3821. [Class 146 (ii).] A device for the use of alternative codes comprises a plurality of strips 4, mounted in a frame 1, having transparent sides, so that the set of symbols and appropriate code signs on one side of the strips 4 may be observed, while the corresponding complementary code signs and symbols on the reverse side of the strips 4 are available by turning the frame over back to front. The strips are interchangeable and are provided with suitable symbols 11 for arranging them in predetermined sequence. The code symbols are printed in different colours on the back and front of the strips and a narrow black line of demarcation 20 is provided along the longitudinal edges of each face. Finger-pieces 5 are provided in the frame 1 for removal of the strips. The code cards are normally arranged in compartments in a box, which also serves to accommodate the frame: alternatively a protecting wallet may be provided for carrying the frame, furnished with pockets to receive the strips. In a modification the code strips may be arranged horizontally.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB382130A GB348069A (en) | 1930-02-04 | 1930-02-04 | An improved device for use in connection with codes |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB382130A GB348069A (en) | 1930-02-04 | 1930-02-04 | An improved device for use in connection with codes |
Publications (1)
Publication Number | Publication Date |
---|---|
GB348069A true GB348069A (en) | 1931-05-04 |
Family
ID=9765551
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB382130A Expired GB348069A (en) | 1930-02-04 | 1930-02-04 | An improved device for use in connection with codes |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB348069A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2445611A (en) * | 2007-01-09 | 2008-07-16 | John Clifford Compton | Linear slide rule for decoding symbolic data |
-
1930
- 1930-02-04 GB GB382130A patent/GB348069A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2445611A (en) * | 2007-01-09 | 2008-07-16 | John Clifford Compton | Linear slide rule for decoding symbolic data |
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