GB291015A - Improvements in perspective drawing apparatus - Google Patents
Improvements in perspective drawing apparatusInfo
- Publication number
- GB291015A GB291015A GB15143/28A GB1514328A GB291015A GB 291015 A GB291015 A GB 291015A GB 15143/28 A GB15143/28 A GB 15143/28A GB 1514328 A GB1514328 A GB 1514328A GB 291015 A GB291015 A GB 291015A
- Authority
- GB
- United Kingdom
- Prior art keywords
- links
- linkages
- lengths
- pivoted
- equal
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
- B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
- B43L7/00—Straightedges
- B43L7/10—Plural straightedges relatively movable
- B43L7/12—Square and pivoted straightedges
Landscapes
- Drawing Aids And Blackboards (AREA)
Abstract
291,015. Andriessens, C. May 23, 1927, [Convention date]. Centrolineads.-An instrument for use in preparing perspective drawings consists of a fixed ruler c and a movable ruler d, the two being connected by two linkages each in the form of a rhombus AJCK and BLDM, the linkages being pivoted to the rulers by their corners A,C and B, D at such positions that the lengths CD and AB are equal. The lengths of the linkage arms can be adjusted by sliding them through the central pivots J, K and L, M. To maintain the links BL, BM parallel to the links AJ, AK respectively these links are all extended below the pivots AB and are connected by pivoted links e, f, the length of each of which is equal to the distance AB.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE291015X | 1927-05-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB291015A true GB291015A (en) | 1928-11-01 |
Family
ID=6065447
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB15143/28A Expired GB291015A (en) | 1927-05-23 | 1928-05-23 | Improvements in perspective drawing apparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB291015A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2484361A (en) * | 1946-01-22 | 1949-10-11 | Eugene S Upton | Drawing instrument |
US2565724A (en) * | 1945-02-05 | 1951-08-28 | Boeing Co | Perspective drafting machine |
-
1928
- 1928-05-23 GB GB15143/28A patent/GB291015A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2565724A (en) * | 1945-02-05 | 1951-08-28 | Boeing Co | Perspective drafting machine |
US2484361A (en) * | 1946-01-22 | 1949-10-11 | Eugene S Upton | Drawing instrument |
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