Claude Lorraine glass

Claude´ Lor`raine´ glass`

1.A slightly convex mirror, commonly of black glass, used as a toy for viewing the reflected landscape.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
There are poems on the still life that lends its title to the collection, and which Jouet kept on his desk during those years, composed of a turnip, a linen napkin, and a Claude Lorraine glass (an optical instrument developed in the eighteenth century and used by landscape painters).