Box of glass slides for use in synoptophore, by Clement Clarke Ltd., 16 Wigmore Street, London, W1, England. Box of glass slides for use in synoptophore
Set of 12 slides, cased, for use with myoscope, by Clement Clarke and Co. Ltd., English Set of 12 slides
Two Sharp Crawford rotating slide holders with slides, for use with synoptophore, invented in 1931 Two Sharp Crawford rotating slide holders with slides
