Synoptophore possibly invented by Walter Green
1931-1940
Synoptophore by Clement Clarke Ltd.
1929-1936
Synoptophore by Clement Clarke Ltd.
1929-1940
Green synoptophore
Two Sharp Crawford rotating slide holders for use with synoptophore
Two Sharp Crawford rotating slide holders with slides
Box of glass slides for use in synoptophore
Synoptophore, English, 1930-1950
1930-1950
Synoptophore by Clement Clarke Ltd.
1929-1940
Synoptophore, possibly invented by Walter Green
1931-1940
Two boxes of glass synoptophores
Two boxes
Synoptophore by Clement Clarke Ltd.
1930-1940