Two lens doublets in drawtube inside another tube

1801-1900

Two plano convex lenses set in concentric tubes

1801-1900

Two convex lenses in concentric tubes

1801-1900

Microscope eyepiece, German, 1851-1900

1851-1900

Beck spectroscope, late 19th century

1871-1900

Amblyoscope, hand held with eight small plastic pictures

1920-1940