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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211197DE MAGNETE.& æquabilis, pendula æque longa in eadem Terræ regione ſemper
æque velociter eoſdem circulorum arcus deſcribunt; ſi gravitas au-
geretur nonnunquam, & alia tempeſtate decreſceret, admodum
inæquali velocitate pendula concitarentur; pendula igitur Magneti-
ca, ita enim Acus Magneticas vocare licet, vi admodum inæqua-
li agentur, majori quando velocius deſcribunt arcus ſuos, minori
cum lentius decurrunt per æqualia ſpatia: Congruit hæc obſervatio,
cum iis quæ in capite ſecundo memoravimus, vim Magnetis non
ſemper ad elevandum Ferrum eandem eſſe, tum eam aliquando ex-
porrigi ad diſtantiam duplo vel triplo majorem, uti eſſectus in idem
Verſorium evincunt.

Ecce Grahami accuratiſſima Experimenta, cum Acu Inclinatoria
capta, oſcillationem incipiente in arcu 10 graduum.

11
1723. # # Vibrationes. # # Tempus.
# # # M. # Sec.
April. # 1. # primæ 50 # 3? # 2?
# # ultimæ 50 # 2 # 45
# 2. # primæ 50 # 3 # 3
# # ultimæ 50 # 2 # 43
# 3. # primæ 50 # 2 # 52
# # ultimæ 50 # 2 # 39
# # eodem die # primæ 50 # 2 # 53
# # elapſâ horâ
# # ultimæ 50 # 2 # 35
# 4. # primæ 50 # 2 # 54
# # ultimæ 50 # 2 # 30
22
# # # Vibrationes. # # Tempus.
# # # Min. # Sec.
April. # 28. # primæ 50 # 2 # 48
# # ultimæ 50 # 2 # 16
# # eodem die # primæ 50 # 2 # 47
# # ultimæ 50 # 2 # 16
Maji # 20. # primæ 50 # 3 # 11
# # ultimæ 50 # 3 # 1
# # # # # Acu denuo ſuper Magnete ducta.
# # primæ 50 # 2 # 38
# # ultimæ 50 # 2 # 23
# # eodem die # primæ 50 # 2 # 38
# # elapſa horâ
# # ultimæ 50 # 2 # 20

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