![](https://coimages.sciencemuseumgroup.org.uk/74/294/medium_thumbnail_1990_0459__0002_.jpg)
Circular slide rule for surveying calculations: "Cox's stadia computer"
- Made:
- New Jersey
![Circular slide rule for surveying calculations: Cox's stadia](https://coimages.sciencemuseumgroup.org.uk/325/571/medium_smg00047722.jpg)
Circular slide rule for surveying calculations: "Cox's stadia computer", plastic, made by Whitehead-Hoag, New Jersey for W. & L.E. Gurley, Troy, New York
Circular slide rule for surveying calculations: "Cox's stadia computer", plastic, made by Whitehead-Hoag, New Jersey for W. & L.E. Gurley, Troy, New York