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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212198DISSERTATIO11
Maji. # 21. # primæ 50 # 2 # 41
# # ultimæ 50 # 2 # 28
# 23. # primæ 50 # 2 # 40
# # ultimæ 50 # 2 # 27
22
# 25. # primæ 50 # 2 # 41
# # ultimæ 50 # 2 # 30
# 27. # primæ 50 # 2 # 41
# # ultimæ 50 # 2 # 28

Intuiti prima fronte hæc Experimenta ſuſpicaremur Aëris rarita-
tem majorem minoremve variis diebus, plus minuſve reſiſtere oſcil-
lanti Acui, & ideo eam varia velocitate arcus ſuos abſolvere, ve-
rum tanta raritatis, & proinde reſiſtentiæ, differentia in aëre non
obtinet horæ intervallo, ut inde in oſcillationibus adeo notabilis
diverſitas oriatur, quæ obtinuit in Experimentis tertio Aprilis &
Vigeſimo Maji captis: An inde non ſequitur vim Magnetis omni
fere temporis minuto eſſe diverſam, nunc majorem, ſequenti mo-
mento autem minorem abſque ordine ullo? Hoc colligo ulterius ex
aliis Experimentis, quum enim Acus primas oſcillationes 50 abſol-
vit intra determinatum tempus, & ſecundas 50 etiam intra aliud,
ſed determinatum tempus; an non deberet ſemper ultimas 50 vi-
brationes deſcribere intra idem tempus, deſcriptis 50 primis in tem-
poribus æqualibus, & poſita vi Magnetica aliquamdiu conſtanti,
verum ea perpetuo variante etiam ultimæ 50 vibrationes brevius
longiuſve tempus poſtulabunt: Ecce Vigeſimo Maji in duobus ul-
timis tentaminibus, primæ 50 Vibrationes peractæ ſunt 2? , 38? . ſed
ultimæ 50 in medio tentamine abſolvebantur 2? , 2? , & ultimæ 50
in poſtremo tentamine peragebantur 2? , 20? . Ita comparemus ten-
tamina inſtituta Maji 21 & 25. ubi primæ 50 Vibrationes abſolu-
tæ ſunt 2? , 41? . ſed 50 ultimæ in primo tentamine 2? , 48? . & 50
ultimæ in poſtremo tentamine 2? , 30? . In hac ſententia me conſir-
maverunt plurima alia Experimenta cum Magnete capta; Magnetis
Declinatio ope longæ Acus explorata, perpetuo mutatur, veluti
ſupra in Exp. XC. oſtendimus: Inclinatio Acus fere nunquam
eſt eadem, licet uno die 10 tentamina inſtituantur; quæ modo me-
moratis addita obſervationibus, luce Meridiana clarius evincunt,
perpetuis mutationibus vim Magneticam eſſe obnoxiam, ſive di-
rectionem, ſive virium magnitudinem ſpectemus. Hoc forſitan

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