Primitiae gnomonicae catoptricae, hoc est, Horologiographiae nauae specularis ... (1635)
Kircher, Athanasius, 1602-1680 · Auenione : Ex typographia I. Piot ... · leaf 233
' … zodiaco radiofo fu per horas in lemicircido Q. A S. notatas v.g. fuperhora 6. qua: in hoc litu fcmicir- culi Q AS. cade erit quae hora 6. d udoque per omnes Tignorum radios filo, imprimes punda in muro : per haec enim fi vnam redam duxeris , habebis ho- ram defideratam i liue ea fuerit orientalis,…
Sundials
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
![An illustration from Pratica uniuersale, facilissima et breue di misurare con la uista, parte prima[-II] ... (1630)](https://img.insideoutlibrary.com/img/200/ia-praticauniuersal00malo-237-0.webp)
![An illustration from M. Vitrvvii De architectvra libri decem : nuper maxima diligentia castigati atq[ue] excusi : additis Iulij Frontini De aqueductibus libris propter materiae affinitatem (1522)](https://img.insideoutlibrary.com/img/200/ia-mvitrvviidearchi00vitr-144-56.webp)
