Open University McArthur microscope and accessories
1972
McArthur portable microscope
1955-1957
McArthur portable microscope
1972
McArthur portable microscope
1935-1937
Hand-held microscope, early 1930s.
1930-1935
McArthur microscope
1954
McArthur portable microscope
1934-1936
McArthur portable microscope
1983
McArthur portable microscope
1930
McArthur portable microscope
1946
Open University McArthur microscope
1972