ASTRONOMY - Apian, Peter. Folium Populi. Instrumentum iam recens inventum, et in figuram folii populi redactum per radios solis toto orbe horas com[m]unes ostendit / In this new instrument, which has the form and shape of a leaf, the common hours of the day are found in the whole world. With large woodcut title by Hans Brosamer, a large woodcut coat of arms and a folding woodcut plate. Ingolstadt, October 22, 1533. folio. [11] ll., [1] w. Modern brochure. VD16 A 3084 - Stalla 79 - Schottenloher, Apian 36 - Ortroy 106 - Zinner, Instruments 116. - First edition. - "This work, written in Latin and German, treats of a sundial in the form of a poplar leaf for finding the ordinary hours, the hours of the rising and setting of the sun, and the hours of unequal length" (Zinner 1513). - With the often missing representation of the poplar leaf to be taken out and glued on wood for use. - The folding plate with kl. tear in the fold.