

Eidograph, by Alexander Adie, middle bar divided and numbered 0 to 70 each way; arms 70 one way, and 80 the other.
Details
- Category:
- Mathematics
- Object Number:
- 1911-240 Pt2
- credit:
- British Admiralty (Hydrographic Department)
Eidograph, by Alexander Adie, middle bar divided and numbered 0 to 70 each way; arms 70 one way, and 80 the other.