Semicircular land surveying
Both these instruments with semicircular degree scales were devised for surveying in the field. While [1] has elaborately cut-out rectangular sights, the user of [2] simply looks along the tips of the upright pins.
Other narratives:
- Comment by visitor
- Inventory no. 47382 - Former Display Label
- Bennett, J. and Johnston, S., The Geometry of War, 1500-1750 (Oxford, 1996)