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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3218DISSERTATIO duabus, aut pluribus, ſed incaſſum hucusque adhibitus fuit omnis
labor.
EXPERIMENTUM II.
Nolui vero acquieſcere in Experimentis cum hiſce tantum Mag-
netibus factis, quia ſperabam fortuito me obſervaturum aliquid
in aliis, quod hi bini ſuppeditare non potuerant:
poſſet enim he-
terogeneitas materiæ alterutrius cauſa eſſe, quo minus quædam accu-
rata &
conſtans proportio inter vires attrahentes & diſtantias obtine-
ret.
Adeoque eundem Magnetem ſphæricum magnum NO reliqui in
eodem menſæ loco, ſed ex bilance GX ſuspendebam Magnetem ali-
um, nudum ſive non armatum, (quales ſemper Experimentis inſer-
vierunt;)
forma hujus Magnetis erat parrallelepipedo ſimilis, altitu-
dinis 2 pollic.
longitudinis 2 {1/2}, latitudinis 1 {7/12}: hunc etiam ita ſuspen-
debam, ut ambo poli eſſent in recta ad horizontem perpendiculari,
&
in eadem linea cum ambobus polis Magnetis alterius, tum Expe-
rimenta dederunt attractionis ſequentes magnitudines.
Experimenta hæc ſunt facta 11 Julii Ao. 1725. Baroſcopio elevato
ad 29 {5/24} pollic.
Thermoſcopio Fahrenheiti ad 62 grad. flante Borea,
cælo ſicco &
ſereno
11
Diſtantiæ \\ pollic. # Lin. # Attractiones æquales \\ granis Medicis
12 # 0 # 0
9 # 0 # 1 {1/8}.
8 # 0 # 1 {1/2}.
7 # 6 # 2.
7 # 6 # 2 {1/2}.
# 12 # 70 {1/2}.
# 11 # 75 {1/2}.
# 10 # 85.
# 9 # 92.
# 8 # 100.
# 7 # 106.
# 6 # 111.
# 5 # 132.
# 4 # 149.

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