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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6450DISSERTATIO. longiorem acum ad diſtantiam 9. poll. à Magnete efficere angulum
paulo majorem, quam acum breviorem ad diſtantiam 3. pollicum.
Acum breviorem ad diſtant. 9. poll. facere angulum 9. grad. minorem,
quam longiorem in eadem diſtantia: ſed hæc paradoxa facile in-
telligentur, ſi conſideramus diſproportionem longitudinis acus, nam
cuſpis longioris acus ad diſt. 9. poll. erat propior Magneti 1. poll.
quam cuſpis brevioris acûs; & cuſpis brevioris acûs in diſtantia
9. pollic. a Magnete, diſtabat 5. poll. plus, quam acus majoris,
cum Magnes in eodem gradu Quadrantis erat: Unde ad hanc diſpro-
portionem attendendum. Notandum præterea, Magnetem in diſtantia
5. ped. ab acu, facere angulum 2. grad. cum una acu, & 2 {1/2} grad.
cum altera acu: ſed in majori diſtantiâ non fieri obſer vabilem mutatio-
nem in Acu: Ita ut vis Magnetica extendatur eouſque ad 5. ped. in
quibus proportiones capi poſſunt, ſed in majoribus diſtantiis, vis
Magnetis eſt adeo debilis, ut nihil certi obſervetur.

11
# # # # Experimenta cum breviori # # # # Experimenta cum Longiori Acu
Diſtantiæ \\ Acus a \\ Magn. in \\ poll. # # Anguli ad \\ quaſſibet \\ diſtantias \\ facti ab Acu # Differentiæ \\ comparatæ \\ inter ſe, in \\ Minutis # Diſtantiæ \\ Acus a \\ Magn. in \\ poll. # # Anguli ad \\ quaſlibet \\ diſtantias \\ factiab Acu # Differentiæ \\ comparatæ \\ cum priori- \\ bus in Mi- \\ nutis.
# Gr. # M. # # # Gr. # M.
3 # 87 # 0 # 180 # 9 # 87 # 30 # 345
6 # 84 # 0 # 330 # 12 # 81 # 45 # 570
9 # 78 # 30 # 570 # 15 # 72 # 15 # 1137
12 # 69 # 0 # 735 # 18 # 53 # 20 # 1100
15 # 56 # 45 # 795 # 21 # 35 # 0 # 660
18 # 43 # 30 # 630 # 24 # 24 # 10 # 380
21 # 33 # 0 # 540 # 27 # 17 # 50 # 280
24 # 24 # 0 # 360 # 30 # 13 # 10 # 180
27 # 18 # 0 # 270 # 33 # 10 # 10 # 130
30 # 13 # 30 # 150 # 36 # 8 # 0 # 90
33 # 11 # 0 # 135 # 39 # 6 # 30 # 75
36 # 8 # 45 # 105 # 42 # 5 # 15 # 65
39 # 7 # 0 # 90 # 45 # 4 # 10 # 40
42 # 5 # 30 # 60 # 48 # 3 # 30 # 30

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