Baliani, Giovanni Battista, De motu naturali gravium solidorum, 1638

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              <s id="s.000305">PROPOSITIO XXV. </s>
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                <s id="s.000306">In circulo Orthogonaliter erecto, si a summitate ad
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                puncta peripheriae ducantur plana, quo tempore gra-
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                ve perpendiculariter inde pervenit ad planum ori-
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                zontale; si descendat per dicta plana, eodem perve-
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                niet respective ad quodlibet dictorum punctorum
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                peripheriae.
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              <s id="s.000307">Sit circulus cuius centrum B, & diameter AC erectus
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              super plano orizontali GC, & in eo ducta sint plana de-
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              clinantia a puncto A ad puncta peripheriae DEF, & de-
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              scendant gravia super dicta plana, & perpendiculariter.
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              </s>
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              <s id="s.000308">Dico quod eodem tempore pervenient ad, D, E, F, C.
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              <s id="s.000309">Ducantur DC, EC, FC.
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              </s>
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              <s id="s.000310">Quoniam puncta praedicta sunt ea, in quae cadunt perpendi-
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              cularia ducta a puncto C in AD, AE, AF
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              , eo perveniunt
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              gravia eodem tempore quo in C
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              . </s>
              <s id="s.000311">Quod probandum fuit.
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              Per 30.
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              Tertii.
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              Per 16.
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              hujus.
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              </s>
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