Scarce c. 1860s "Transparent Slate" with Eleven Engravings for TracingThis is a scarce one an early "transparent slate," c. 1860s, used as a drawing teaching tool. (The man pictured is Charles Fremont, Senator from California, first Republican candidate for president in 1856, and best known as "the Pathfinder" for expeditions to open the West to settlers.) As per the instructions on the back of the frame, one was meant to place one of the included engravings in the frame, use a "fine pointed black lead pencil" to trace
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Scarce c. 1860s "Transparent Slate" with Eleven Engravings for Tracing