Part of surveying level, British, 1841 Materials: brass (copper, zinc alloy) , glass , alcohol , ivory , cotton (fibre) , silver (metal) and iron Object Number: 1912-199 Pt1 type: instrument component , surveying level , magnetic compass and filar micrometer
Tripod for surveying level, British, 1841 Object Number: 1912-199 Pt2 type: instrument component and tripod - stand
Box for surveying level, British, 1841 Box for surveying level, British, 1841 Object Number: 1912-199 Pt3 type: instrument case
Part of surveying level, British, 1841 Object Number: 1912-199 Pt4 type: instrument component and surveying level
Telescope used by General Roy for measuring base line to link Paris and Greenwich (base line measurement)