Casati, Paolo - Terra machinis mota : dissertationes geometricae, mechanicae physicae hydrostaticae

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1ad lineam horizontalem excitetur perpendi
cularis æqualis Tangenti gr. 1. (accepto ſe.
ſemiſſe numeri Canonis in partibus vnciæ
centeſimis) abſcindi poterit ex arcu gradus
vnus, cuius ſinus parum diſtabit à palmo
Romano architectonico. Quare facilè pote
rit arcus in 60 minuta diuidi, & ex eodem
centro interuallo maiore deſcripto alio arcu,
poterunt duci lineæ tranſuerſæ, in quibus
minutorum partes ſexageſimæ diſtingui po
terunt, prout moris eſt. Hoc inſtrumento pa
rato angulum depreſsionis inſra horizontem,
ſeu potiùs infra lineam horizonti parallelam,
tam clarè poſſumus deprehendere, vt nihil
reliquum quod deſideremus.

Guld. Nec omnibus nec vbique locorum
commodum erit tuum hoc inſtrumentum
fabricari, quod vel vni loco affixum ſit opor
tet, vel ægerrimè transferri poſſit. Neſcio

quo fato adhuc penès me in ſemilacerâfffff pa
gellâ durat ſchediaſma hoc, quo ante men
ſes aliquot cuidam, qui ſe in Geometriæ pra
xi exercens dolebat nullum hactenus à ſe ad
hibitum inſtrumentum, cui citrà inſignis
erroris ſuſpicionem poſſet fidere, organum
propoſui, quod & facilè conſtruitur, & vix
vllum relinquit errandi periculum, prout ipſa
docuit experientia. In triangulum còag

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