"Paire De Miroirs Pour Expériences d'Optique"
Nice pair of mirrors for optical demonstrations. Often used in physics classes in the 19th century to illustrate the properties of light. One of the mirrors is convex, the other is concave. Some accidents in the wooden frame (see pictures), some minor stains and accidents on the mirrors (see pictures). The height of the mirrors is adjustable as well as their orientation. Nice feet of 23cm diameter in turned wood. 
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