Description
Study of the Green-winged Teal (Anas carolinensis)
Five figures sketching basic optical details of a conventional and periscopic camera obscura
This single prism spectroscope has a simple equatorial mount adaptor for a 5-inch telescope
Other boats are drydocked next to various buildings
Waltham Forest
18th-Century Engraving of John Harrison mb-code AAED002730 Study of the Green-winged Teal
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