1977/018
Ellipsograph trammel in mahogany
c.1860
Ellipsograph trammel in mahogany and box(?) comprising a cruciform groove (broken) and a beam with 3 wedged clamped bases two for the groove girder (one replacement) and one for the drawing point (replacement).
Used for drawing ellipses on plans.
JF Heather in “Mathematical Instruments” London 1884 commented that ellipsographs do not work satisfactorily and recommended using strips of paper as a construction aid for better results.
| Acquisition Number | 1977/018 |
|---|---|
| Item Type | |
| Short Description | Ellipsograph |
| Manufactured by | |
| Date of Manufacture | c. 1860 |
| Sub-items | None |
| Supporting Items | None |
| Makers Number | None |
| Marks | Unmarked but with traces of manuscript ink on labels glued to beam and groove. |
| Dimensions (mm) | Beam: 860 (L) x 17 (W) x 11 (H). Cruciform runners: 585 (L) x 36 (W) x 20 (H). Weight 650 g. |
| Donor | |
| Date Donated | December 1977 |
| Materials | Mahogany |
| Condition | Good |
| Display Location |
