Drum microscopes Microscope No. 260; c1745 Microscope No. 261; 1750 Tiedemann Microscope No. 134; c1790 Microscope No. 56, 1841 Richebourg Microscope No. 315, c1845 Oberhaeuser Microscope No. 191, 1848 Microscope No. 202, c1850 Nachet Microscope No. 136, c1850