DE80441C - - Google Patents
Info
- Publication number
- DE80441C DE80441C DENDAT80441D DE80441DA DE80441C DE 80441 C DE80441 C DE 80441C DE NDAT80441 D DENDAT80441 D DE NDAT80441D DE 80441D A DE80441D A DE 80441DA DE 80441 C DE80441 C DE 80441C
- Authority
- DE
- Germany
- Prior art keywords
- ellipse
- spring
- roller
- ruler
- tips
- 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.)
- Active
Links
- 238000004904 shortening Methods 0.000 claims 1
- 238000010276 construction Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
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
- B43L11/00—Non-circular-curve-drawing instruments
- B43L11/02—Non-circular-curve-drawing instruments for drawing conic sections
- B43L11/04—Non-circular-curve-drawing instruments for drawing conic sections for drawing ellipses
- B43L11/045—Non-circular-curve-drawing instruments for drawing conic sections for drawing ellipses with cords or like flexible elements
Landscapes
- Lenses (AREA)
- Drawing Aids And Blackboards (AREA)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE80441C true DE80441C (cg-RX-API-DMAC7.html) |
Family
ID=352995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DENDAT80441D Active DE80441C (cg-RX-API-DMAC7.html) |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE80441C (cg-RX-API-DMAC7.html) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2831251A (en) * | 1955-12-02 | 1958-04-22 | Noble G Barker | Ellipsograph |
-
0
- DE DENDAT80441D patent/DE80441C/de active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2831251A (en) * | 1955-12-02 | 1958-04-22 | Noble G Barker | Ellipsograph |
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