Lens with adjustable aperture attachment
1937-1941
Bellows for use with Leitz Panphot microscope
1937-1941
Unidentified lens with locking screw
1937-1941
Nelson's dark ground illuminator
Condenser lens with adjustable aperture
1937-1941
Periplan eyepiece with 6x magnification
1937-1941
Metal component containing a circular lens
1937-1941
Condenser lens with adjustable aperture
1937-1941
Large Leitz Panphot type microscope with camera arm
1937-1941