Fabrica et vsvs : instrvmenti ad horologiorvm descriptionem peropportvni : accessit ratio describendarvm horarum a meridie & media nocte exquisitissima, & nunquam ante hac in lucem edita (1586)
Clavius, Christoph, 1538-1612 · Romae : Apud Bartholomaeum Grassium · leaf 11
3 P R AE F A T I O- … ftgna afcendentta ,&c, adieeimufqi ad calcem lib. 7. conBrudionem, atq; yfum inflrumenti cuiufdam,quo fine yUaferc moleftia ( modo inflru- . mentum adftt rite conBruBum ) in plano quolibet, & ad quamuis altitu- dinem poli horologia pojfint deferibi , Sed quoniam , licet laborem illum noBrum…
Sundials
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
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