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)
UBER. TERTIVS. I.XXXI Dentur nunc coni tres , quales in adieda figura pinximus ,BRD, I R K,8c N R 0 , 8c fuperior fit conuexus B A DC, in quo gnomonis … longitudo afsignata efi.huius quantitas numeretur in « v ab « ufqj in e quo ducatur linea inclinationis coni {.*,io hunc modum: a i numeretur dimetiens coni ufcg in \8C bipertita i A in r,ex eo deicendat ad « /i arqua bilis n s ,in hac numeretur longitudo coni B R uel D R e { pundo, operationem…
Sundials -- Early works to 1800
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
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