Title: A Philosopher Shewing an Experiment on the Air Pump
Object type: Print
Date: 1769
Artist:  Valentine Green 
Artist bio: British, Salford 1739–1813 London
Artist nationality: British
Artist role: Engraver
Medium: Mezzotint; first state of two (Chaloner Smith); second state of three (Whitman)
Dimensions: Plate: 19 × 23 in. (48.3 × 58.4 cm)
Sheet: 19 7/8 × 25 5/8 in. (50.5 × 65.1 cm)
Classification: Prints
Credit line: The Elisha Whittelsey Collection, The Elisha Whittelsey Fund, 1949
Department: Drawings and Prints
Repository: Metropolitan Museum of Art, New York, NY
Tags: term: Science, term: Birds, term: Children, term: Men, term: Women