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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DISSERTATIO
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<
s
xml:id
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echoid-s3958
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xml:space
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">Colligimus ex his Experimentis Declinationem Acus variare fere
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qualibet hora, imo forte quolibet Minuto, uti nonnullæ obſerva-
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tiones demonſtrant.</
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<
s
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echoid-s3960
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xml:space
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">2°. </
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<
s
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echoid-s3961
"
xml:space
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preserve
">Duas Acus, eidem Magneti affrictas, habere diverſam Declina-
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tionem, unâ declinante in Cupro 14°. </
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<
s
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echoid-s3962
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xml:space
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">30`. </
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<
s
xml:id
="
echoid-s3963
"
xml:space
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">alterâ in capſulâ li-
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gnea 14°. </
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<
s
xml:id
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echoid-s3964
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xml:space
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">25`.</
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<
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"/>
</
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<
s
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echoid-s3966
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xml:space
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">3°. </
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<
s
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"
xml:space
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">Patet quodDeclinatio major & </
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>
<
s
xml:id
="
echoid-s3968
"
xml:space
="
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">minor mutabatur in utraque Acu
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ſimul, ſed non æqualiter, nunc enim fiebat in hoc Acu major, nuncin
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alterâ: </
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>
<
s
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echoid-s3969
"
xml:space
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preserve
">ambæ primæ obſervationes cum Acu in cuprea capſula pro-
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bant variationem = 10 M`. </
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>
<
s
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echoid-s3970
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xml:space
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preserve
">cum in ligno variatio nis differentia erat
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æqualis 5 M`. </
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<
s
xml:id
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echoid-s3971
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xml:space
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preserve
">Sed tertia variatio in Cupro differt a ſecunda modo 5 M`.
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</
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<
s
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echoid-s3972
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xml:space
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">tertia vero in Ligno differt a ſecunda 10 M?</
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">.</
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<
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">4°. </
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<
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">Sed intra ſpatium 3 hor. </
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<
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">8`. </
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<
s
xml:id
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echoid-s3977
"
xml:space
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">variatio fuit in utraque acu =
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30 M.</
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<
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"/>
</
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<
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<
s
xml:id
="
echoid-s3979
"
xml:space
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">Utinam obſervator ſimul attendiſſet ad ventos, eorumque muta-
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tiones! forte enim inde aliquid detegere potuiſſet.</
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<
s
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</
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<
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<
s
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xml:space
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">Sed annectere lubet alias obſervationes dierum ſequentium, ut
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ex iis conſtet, ſemper, & </
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<
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xml:space
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">quotidie eas Acûs mutationes contingere,
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imo & </
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<
s
xml:id
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xml:space
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">qualibet hora.</
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Declin. # Grad. # M. # Hora. # M.
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Martii \\ 9 # 14 # 10 # 9 # 30
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# 14 # 10 + # 10 # 0
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# 14 # 10 # 10 # 15
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# 14 # 10 + # 10 # 30
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# 14 # 15 # 11 # 0
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# 14 # 0 # 8 # 15
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# 14 # 0 # 11 # 50
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Martii \\ 10. # 14 # 10 + # 10 # 0
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# 14 # 15 # 11 # 0
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# 14 # 15 # 12 # 0
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# 14 # 15 + # 12 # 45
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# 14 # 15 + # 2 # 0
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# 14 # 15 # 3 # 30
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# 14 # 15 + # 4 # 0
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# 14 # 15-- # 5 # 30
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# 14 # 10 # 6 # 0
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# 14 # 0 # 6 # 15
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# 14 # --- # 6 # 30
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