concave lens
1790-1819
Plano-convex lens in mount
Lens on adjustable arm
1850-1924
Two cork and one wood framed polari-scope lenses
Nikon WC-E63 lens
Convex lens in mount
Two convex lenses
1760-1850
Convex lens in mount
Two concave and one convex lens
1760-1850
Plano-convex lens mounted in flange
Plano-convex lens mounted in flange
Four crown glass convex lenses
Plano-convex lens in mount
Convex lens in mount
1780-1850
Three lenses
1760-1850
Convex lens
1760-1850
Convex lens
1760-1850
Lenses in mounts
Convex lens in slide holder
1750-1800
Convex lens in circular mount
1760-1850
Convex lens
Six lenses of varying size and type
Two lenses in circular box
Model: showing concave lens virtual image
1752-1755
Lens polisher
Plano-convex lens in cylindrical mount
Glass lens in threaded mounting cell
1800-1850
Green glass lens
1 Convexo convex lens
1790-1819
Reading glass magnifying lens in horn frame
1701-1750
burning glass
1780-1800
Condenser Lens
1920-1930
lens for USAAF Aircraft camera, type K20, 1940-1945
1940-1945
Camera Lens
1900-1910
Bi-convex lens in bluish glass 6 1/4" diam
1760-1780
Six lenses
1760-1850
Convexo convex lens 3 3/8" diameter, wooden frame
1790-1819
Concave lens
1790-1819
Projector Lens
1875-1885
Sectioned glass lens from eye model
'Special' rectilinear lens
Magnifying glass lens
Three eyepiece lenses in mahogany box
1800-1899
Prof. Exner's glass cylinder
Mounted concave mirror
Projector Lens
1860-1870
Bi-convex crown lens
1980
Bi-convex crown lens
1980
