Mason's wet and dry bulb hygrometer
1850
Variation Compass and magnetometer, 1837-1843
1837-1843
Herschel type actinometer, 1849-1851
1849-1851
Theodolite by Robinson
1835-1841
Miner's surveying compass, 1845-1855
1845-1855
6 inch transit theodolite by Henry Barrow & Co.
1849-1851