French drum microscope, in case, 1850-1900
1851-1900
Drum microscope in case
1825-1850
Drum microscope, English, mid-nineteenth century
1840-1850
Compound monocular drum microscope by Trecourt and Georges Oberhaeuser
1825-1850
Drum microscope
1831-1870
Drum microscope
Drum microscope
1831-1870
Tiny drum microscope
1871-1900
Unsigned drum microscope
1831-1860
Drum microscope in case
1851-1875
Portable drum microscope by G. Francis
1825-1850
Unsigned drum microscope in case
1825-1850
Unsigned drum microscope in case
1825-1850
Drum microscope
1871-1900
Drum microscope by Secker of Paris, 1801-1850
1801-1850
Unsigned drum microscope in case
1801-1830
Drum microscope with spring focusing
1831-1870
Drum microscope, French, mid 19th century
1831-1870
Drum microscope with side pillar
1826-1850
Drum microscope, second half of 19th century
1851-1900
Drum microscope
1831-1870
Drum microscope in case, English, mid 19th century
1825-1850
Unsigned drum microscope
1790-1810
Drum microscope, unsigned, English, 1800-1850
1801-1850
Drum microscope
1825-1850
Unsigned drum microscope
1825-1850
Drum microscope
1871-1900
Stand, stage and base of drum microscope (body tube missing)
1831-1870
Drum-type microscope signed "P.T. 1782"
1782
Drum microscope
1851-1900
Drum microscope with pasteboard tubes
1780-1820
Stand and body tube of unsigned drum microscope
1850-1875
Unsigned down microscope
1831-1860