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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207193DE MAGNETE. ad 66, aliquando ad 68, aut ad Minuta diverſa inter gradus 66 &
68 intermedia:
ſequenti die inclinationes conſpexi eaſdem, quæ
tamen plerumque 67 gradum ſignabant:
Has autem tanta cum cura ob-
ſervavi, ut nunquam in aliquo Experimento capiendo quis magis ſolli-
citus eſſe queat, aut majori curâ ad omnes circumſtantias, &
ad ferrum,
quod adeſſe poſſet, removendum, attendere.
Admiramur Acum eodem
die, &
fere eâdem horâ non æqualiter inclinaſſe, quod ab axeos minus
perfecta rotunditate, aut ab Acu non ſatis accurata pendere videretur,
ſed affirmare audeo vitium machinæ attribui non poſſe;
cum axis
chalybeus rotundus perfecte &
vitri ſuperficies politiſſima fuerit:
ſimiles inæquales Inclinationes Acus accuratiſſimæ unum pedem
longæ, obſervavit quoque artificioſiſſimus Grahamus, in Philoſoph.

Tranſact.
N°. 389. qui plurimas cum ſuâ Acu accuratiſſimas inſtituit
obſervationes, variis repetitas diebus, quarum nonnullas hic adne-
ctam.
A M. notat ante Meridiem, P M. poſt Meridiem.
11
# # # # # Anno 1723. Inclinatio. hora diei.
# Gr. # M.
Martii 29 # 75 # 0 # 10 # 0 # AM.
# 74 # 53 # 4 # 15 # PM.
30 # 74 # 55+ # 1 # 0 # PM.
# 74 # 50 # 4 # 0 # PM.
Aprilis 1 # 74 # 25 # 6 # 45 # AM.
# 74 # 20 # 9 # 0
3 # 74 # 20 # 9 # 30 # AM.
# 74 # 50 # 4 # 15 # PM.
22
# # # # # 1723. Inclinat. hora diei.
# Gr. # M.
April 4 # 74 # 55 # 10 # 0
# 74 # 50 # 11 # 15
# 74 # 40 # 12 # 45
# 74 # 35 # 7 # 30 # PM.
5 # 74 # 40 # 9 # 15 # AM.
# 74 # 30 # 8 # 15 # PM.
6 # 74 # 35 # 10 # 0
7 # 74 # 35 # 10 # 20
8 # 74 # 40 # 12 # 15
Multo autem plures loco citato conſpici poſſunt, hæ ſufficiunt inæ-
quali inclinationi Acus intra breviſſimum temporis ſpatium confirman-
dæ.
Eſt longiſſima noſtra AcusSS. Tab. 8. adeo lubricemobilis ſupra

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