Libellus geographicus, locorum numerandi interualla rationem in lineis rectis & sphaericis complectens:
A Latin geography treatise printed in Tübingen in 1562 by Samuel Siderocrates, a Renaissance mathematical text for scholars working on distance measurement in straight and spherical lines. Its pictures are a woodcut coat of arms with a helmeted knight and heraldic eagle, a dense typeset calculation of miles and minutes, and a diagram of squares labelled 625, 225 and 400, which a designer might take from for compact heraldic emblems and for geometric, diagrammatic layouts built on bracketed type.
