Primitiae gnomonicae catoptricae, hoc est, Horologiographiae nauae specularis ... (1635)
Kircher, Athanasius, 1602-1680 · Auenione : Ex typographia I. Piot ... · leaf 163
L I B R I I I. Hi feu lineas fubfidio inftrumenti Azimuthalis fic in horologio defcribes. pofito inftrumento azimu- thico in centro E. ea ratione , vt linea A B. li- neas meridiana exadte refpondeat. Quo fa£to cir- … cumduc femicirculum NSM. ad denos quofuis ordine aut quindenos gradus in inftrumenti cir- culari limbo defcriptos , ( nos hic promouimus ad fingulos denos gradus femicirculum ) referent enim lineas ex centro per di&os gradus dudhe , communes fedliones horizontis , &c circulorum verticalium. Polito…
Sundials
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
![An illustration from Gnomonice Andreae Schoneri Noribergensis, hoc est, De descriptionibvs horologiorvm sciotericorvm omnis generis, proiectionibus circulorum sphaericorum ad superficies, cum planas, tum conuexas concauasq[ue], sphaericas, cylindricas, ac conicas, item delineationibus quadrantum, annulorum, &c. libri tres (1562)](https://img.insideoutlibrary.com/img/200/ia-gri_33125009484227-185-0.webp)
![An illustration from Philippi Lansbergii Triangvlorvm geometriae libri qvatvor : in quibus novâ & perspicuâ methodo, & apodeixei [romanized], tota ipsorum triangulorum doctrina explicatur .. (1631)](https://img.insideoutlibrary.com/img/200/ia-philippilansberg00lans_1-142-0.webp)
