Gassendi, Pierre, De motu impresso a motore translato epistulae duae, 1642

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1& quidvis aliud cum cæteris; pares difficultates
erunt.
An ergo præter cæterorum conjecturas, di­
cere liceat concipi poſſe magneticos radios, ob con­
tinentem emiſſionem, eam rigiditatem tueri, vt fiant
quaſi virgulæ, aut ſaltem quaſi chordulæ tenſæ?
Nempe tametſi ex contiguis duntaxat particulis con­
ſtent; poteſt nihilominùs continua ſuccedentium ſuf­
fectio, indeſinenſque inſtantia, ac vehemens propul­
ſio rigiditatem illam creare; vt in aquæ exſilitione
per anguſtos tubulos manifeſtum eſt fieri.
Certè &
ipſos lucis radios non videmur poſſe alia ratione
concipere, ſiue vibratos, ſiue repulſos?
An proinde vt
lucis radij ex vno quodam puncto prodeuntes, vbi
impinguntur in aquæ planitiem, quacúmque occur­
runt poruli, meatulique, pertranſeunt (quippe ana­
logici ſunt) ſed vnus directè, perpendiculariterve,
cæteri refractè, ſeu cum deflexione ad illum; ita
radij magnetici, quos in orbem effundi conſtat (tan­
quam ex vno centro prodeuntes) vbi impingun­
tur in ferrum, quacúmque ipſis poruli, meatulique
occurrerint, penetrant (ſcilicet analogici) ſed vnus
directe (is nempe, qui per mediam molem, ac velu­
ti axem grauitatis traijcitur) cæteri refractè, defle­
xéque ad ipſum?
Quæcúmque certe eſt in aqua ſo­
lidiuſcularum particularum diſpoſitio, quæ radio­
rum lucis refractionem faciat; eadem radiorum ma­
gneticorum, proportione adhibita, facere refractio­
nem poteſt.
An cùm vtrique radij ſolidas particu­
las vrgeant, illas nempe, quæ verſus medium, per­
pendicularemve ſunt radium, vt pote in quas defle-

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