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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172158DISSERTATIO

Colligimus ex his Experimentis Declinationem Acus variare fere
qualibet hora, imo forte quolibet Minuto, uti nonnullæ obſerva-
tiones demonſtrant.

2°. Duas Acus, eidem Magneti affrictas, habere diverſam Declina-
tionem, unâ declinante in Cupro 14°. 30`. alterâ in capſulâ li-
gnea 14°. 25`.

3°. Patet quodDeclinatio major & minor mutabatur in utraque Acu
ſimul, ſed non æqualiter, nunc enim fiebat in hoc Acu major, nuncin
alterâ: ambæ primæ obſervationes cum Acu in cuprea capſula pro-
bant variationem = 10 M`. cum in ligno variatio nis differentia erat
æqualis 5 M`. Sed tertia variatio in Cupro differt a ſecunda modo 5 M`.
tertia vero in Ligno differt a ſecunda 10 M? .

4°. Sed intra ſpatium 3 hor. 8`. variatio fuit in utraque acu =
30 M.

Utinam obſervator ſimul attendiſſet ad ventos, eorumque muta-
tiones! forte enim inde aliquid detegere potuiſſet.

Sed annectere lubet alias obſervationes dierum ſequentium, ut
ex iis conſtet, ſemper, & quotidie eas Acûs mutationes contingere,
imo & qualibet hora.

11
Declin. # Grad. # M. # Hora. # M.
Martii \\ 9 # 14 # 10 # 9 # 30
# 14 # 10 + # 10 # 0
# 14 # 10 # 10 # 15
# 14 # 10 + # 10 # 30
# 14 # 15 # 11 # 0
# 14 # 0 # 8 # 15
# 14 # 0 # 11 # 50
Martii \\ 10. # 14 # 10 + # 10 # 0
# 14 # 15 # 11 # 0
# 14 # 15 # 12 # 0
# 14 # 15 + # 12 # 45
# 14 # 15 + # 2 # 0
# 14 # 15 # 3 # 30
# 14 # 15 + # 4 # 0
# 14 # 15-- # 5 # 30
# 14 # 10 # 6 # 0
# 14 # 0 # 6 # 15
# 14 # --- # 6 # 30

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