Musschenbroek, Petrus van, Physicae experimentales, et geometricae de magnete, tuborum capillarium vitreorumque speculorum attractione, magnitudine terrae, cohaerentia corporum firmorum dissertationes: ut et ephemerides meteorologicae ultraiectinae

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page |< < (351) of 795 > >|
365351DE SPCULIS VITREIS. eſſet 10 Minutorum, & notavit iterum ad quamnam elevationem
amborum ſpeculorum gutta ſiſtebatur.
11
Diſtantia pollicum \\ a contactu A # # Angulus elevationis \\ ſupra horizontem
# Gr. # Min.
18 {1/2} # 1 # 30
16 {1/2} # 1 # 50
14 {1/2} # 2 # 10
12 {1/2} # 2 # 40
10 {1/2} # 3 # 10
9 {1/2} # 3 # 30
8 {1/2} # 4 # 0
7 {1/2} # 5 # 5
6 {1/2} # 7 # 40
5 {1/2} # 10 # 50
4 {1/2} # 14 # 18
4 # 18 # 0
In hiſce omnibus Experimentis gutta ſive Olei ſive Spiritus vini
B, movetur verſus A, quia partes ſpeculorum in E ſibi propiores
ſunt quam in B, adeoque fortius agunt attrahendo guttam, quæ
ideo ex B movetur in E, ſed quia ſpeculorum partes propiores ad
A, ſibi etiam ſunt propiores, idcirco gutta continuo plus agitur
verſus A, adeoque adſcendit motu accelerato donec ad contactum
A pervenerit.
Sed gutta gravitatem habet, & quia inſiſtit plano inclinato,
quando ſpeculum inferius ab una parte eſt elevatum, poteſt ipſrus
gravitas relativa æqualis eſſe virtuti ſpeculorum ipſam elevanti,
ideo gutta quieſcit ſuſpenſa, poſita elevatione ad certum uſque
gradum;
quo hæc elevatio major eſt, eo gravitas relativa guttæ
eſt major:
ut igitur gutta ſuſpenſa maneat, inter portiones ſpeculo-
rum ſibi propiores hærere debet, tumque iterum vis ſpeculorum e-
levans guttam æquipollebit hujus gravitati relativæ.

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