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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241227de MAGNETE. vit 5 primas oſcillationes intra 20? , ſed 10 oſcillationes intra
39? .

4°. Acus 6 poll. 6 linear. cujus pondus 57 granorum abſolvit 5
vibrationes intra 18? . decem vibrationes intra 35? . 15 vibrationes
intra 52? , viginti vibrationes intra 1? , 10? .

5°. Acus 6 poll. 6 linear. cujus pondus 56 granorum abſolvit 20
vibrationes intra 1? , 14? . in alio tentamine 10 vibrationes intra
40? , viginti intra 1? , 12? . in alio tentamine 20 vibrationes perfecit
intra 1? , 13? . in alio tentamine viginti vibrationes deſcripſit intra
1? , 16? .

6°. Acus 9 pollices longa, cujus pondus 95 granorum abſolvit
10 vibrationes intra 1 Minutum, in alio tentamine in 56? .

7°. Acus 12 pollic. 10 linear. cujus pondus 205 gran. abſolvit 5
vibrationes intra 54? . decem vibrationes intra 1? , 46? . quindecim
vibrationes intra 2? , 39? . viginti vibrationes intra 3? , 30? . triginta
vibrationes intra 5? , 8? .

8°. Acus 5 pollic. 5 linear. ponderis 30 granorum abſolvit 5 vi-
brationes in 35? . decem in 1? , 5? . alias decem in 60? .

Obſervamus in hiſce Experimentis anomalias, illis ſimiles, quas
in Acu Inclinatoria notavimus, æque multæ enim vibrationes non
abſolvuntur ſemper eodem tempore, ſed diverſo, etiamſi inter
tentamina repetita nequidem horæ quadrans interceſſerit, quia vero
pendent oſcillationes hæ â vi directrice Magnetica, quemadmodum
in Acu Inclinatoria, erit maxima hujus virtutis perpetua inæquali-
tas, uti ſupra indicavimus: cæteroquin videntur eſſe Quadrata tem-
porum, quibus vibrationes duarum Acuum variæ longitudinis ab-
ſolvuntur, in ratione compoſita ex directâ longitudinis & gravita-
tis. ſive maſſæ.

Nam Acûs 9 pollicum, ſive 108 linearum, pondus fuit 95 gra-
norum, hi duo numeri per ſe multiplicati, dant 10260: Acus 12 poll.
10 linear.

10260, 31570: : 3600, 11135 {115/171}. 11135 {115/171}=105 +

Sive 154 linear. habet pondus 205 granorum, quæ per ſe mul-
tiplicata dant 31570. a breviori Acu abſolvuntur 10

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