Double image wedge micrometer by Dollond
1754-1769
Split-lens eyepiece micrometer
1870-1874
Amici double image eyepiece position micrometer (in fitted wooden case) and M.S. note
1816-1838
Split-lens eyepiece position micrometer
1820-1830
Eyepieces and other accessories in mahogany case with drawer for Smythian telescope
1825-1829
Split-lens eyepiece position micrometer with spherical crystal micrometer and eyepiece dynameter
1820-1830
Double image micrometer in case
1820-1852
Double image micrometer in case
1820-1852