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Eight Ishihara charts for testing colour blindness, Europe, 1917-1959
colour blindness test
Unknown maker
1917-1959


Dynamical model of the acetylene molecule (housed in its own
model - representation


Claude Lorrain Mirror of black glass (c.1750-70), oblong, in
optical drawing aid - Claude glass
1750-1770



Nasmyth's Steam Hammer, 1845-1855
steam hammer
Nasmyth, James
1845-1855



Model of the "Planet" Locomotive
model - representation; locomotive
Science Museum, Workshops
1830 (original); 1967 (model)