Reading microscope with slide
1880-1885
set of separate parts for moving coil meter
Hansen's Writing Ball, also known as Malling-Hansen Writing Ball
1875-1880
Petrographical microscope 'Eclipse'
1895-1900
'Wollaston Doublet' pocket microscope
1865-1875
Telechrome tube
1944
Norrenberg polariscope with Wheatstone's improvements
1876
Watson Camera Shutter, Type B
1880
Horizontal microscope by Charles Chevalier
1825-1850