Clavius, Christoph
,
Geometria practica
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LIBER TERTIVS.
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Vt vmbrarecta H B, in \\ quadrato abſciſſa # ad lat{us} A B, # Ita longitudo vmbræ pro- \\ iectæ A F, # ad F G,
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#### Vel
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Vt lat{us} A D, # ad vmbram verſam D E, ab- \\ ſciſſam in quadrato # Ita longitudo vmbræ \\ proiectæ A F, # ad F I,
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altitudo propoſita F G, vel F I, proueniet nota &</
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<
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">LONGITVDINEM vmbræ ab altitudine, Sole lucente, quando
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altitudo eſt cognita, ope quadrati apertam, & </
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<
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http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/xxxxxxxx/figures/171-01
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<
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">1. </
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">ſolum hic pro diſtan-
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tia accipimus longitudinem vmbræ, quam altitudo nota, Sole lucente, proii-
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cit. </
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<
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">Sit ergo altitudo A F, eiuſque vmbra proiecta F G. </
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">Dirigatur quadratum
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verſus Solem, vbicunque menſor extra vmbram conſtiterit, & </
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dio Solari per pinna cidiorum foramina, obſeruetur vmbra ſiue recta, ſiue ver-
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ſa, quam filum perpendiculi, vel dioptra abſcindit. </
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<
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">Ita namque ſe habebit latus
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quadrati A B, ad vmbram eius rectam B E, abſciſſam, vt altitudo A F, ad vmbram
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proiectam F G. </
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<
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">Item ſic erit vmbra verſa D E, in quadrato ad latus A D, vt al-
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titudo A F, ad vmbram proiectam F G. </
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<
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">Dioptra denique, vel filo perpendicu-
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li per punctum C, tranſeunte, altitudo A F, longitu dini vmbræ proiectæ F G,
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æqualis eſt. </
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Vt lat{us} A B, # ad vmbram rectam abſciſ- \\ ſam B E, # Ita altitudo nota \\ A F, # ad F G:
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#### Vel
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Vt vmbra verſa D E, abſciſſa \\ in quadrato # ad lat{us} A D, # Ita altitudo nota \\ A F, # ad F G,
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exibit nota longitudo vmbræ proiectæ F G, &</
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viſum, beneficio ſimpliciſſimi cuiuſdam inſtrumenti comperire.</
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