A MAJOR METAMORPHIC COMPENDIUM BY SCHMALCALDER, English, c. 1827. With structures of bright lacquered brass, the stowed compendium forms a compact drum 4″ across and 2″ thick (10 x 5 cm). One side has a large glazed prismatic compass, with tall folding sight vane, hinged and adjustable prism sight, green compass card printed with beautiful florally decorated 32-point rose and circumferential degree scale divided every 20 arcminutes and labeled in reverse with viewing through the lenticular prism. The card
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