![](https://coimages.sciencemuseumgroup.org.uk/74/294/medium_thumbnail_1990_0459__0002_.jpg)
![Ellipsograph patented 6 July 1875 in Washington, D.C](https://coimages.sciencemuseumgroup.org.uk/313/670/medium_smg00045781.jpg)
Ellipsograph patented 6 July 1875 in Washington, D.C. by Morton Toulmin and made by Watts & Co., Baltimore, Maryland, in walnut case with key
Details
- Category:
- Mathematics
- Object Number:
- 1988-734
- type:
- curve drawing instruments and ellipsographs
- credit:
- Tesseract