PROCEEDINGS AM. PHIL. SOC. 



VOL. XXXIV, No. 147, Plate I. 



HOROLOGIUM ACHAZ. 



CHRISTOPHORUS SCHISSLER, GEOMETRICUS AC ASTRONOMICUS ARTIFEX, 

 AUGUST/E, VINDELICORUM, FACIEBAT, 1578. 



NOW IN THE CABINET OF THE AMERICAN PHILOSOPHICAL SOCIETY. 



