Full text: Gravesande, Willem Jacob: Physices elementa mathematica, experimentis confirmata, sive introductio ad philosophiam Newtonianam

PHYSICES ELEMENTA junguntur. Datur ubi concurrunt foramen quadratum in ta-
bella, cujus latus fere pollicem æquat, ut ad memoratas acies
radius luminis in cubiculum tenebroſum per foramen, cujus
diameter æquat quartam pollicis partem, penetrans perveni-
re poſſit.

469.1.

TAB. III.
fig. 4.

Si inter acies memoratas detur diſtantia circiter decimæ
partis unius pollicis, & lumen inter has tranſeat, poſita tabel-
la T ad diſtantiam trium pedum a feneſtra, ſi lumen cadat
ſuper charta A, ad diſtantiam quinque pedum a tabella, ad
latera luminis apparebit, ab utraque parte, lumen ſimile caudæ
cometæ, quod probat lumen inftecti dum juxta acies tranſit,
ut ex figura ſatis patet.

Si magis ad ſe mutuo accedant acies, ut ex. gr. diſtantia in-
ter has ſit centeſimæ partis unius pollicis, loco luminis memo-
rati ab utraque parte apparent fimbriæ coloratæ tres, in ſitu pa-
rallelo ad acies, quæ & magis diſtinctæ apparent, ſi foramen in
feneſtra minuitur. Unde autem colores hi oriantur in ſequen-
tibus dicam. Nunc ſatis erit ex hoc experimento deducere,
lumen attrabi a corporibus a quibus radii inflectuntur; niſi e-
nim daretur motus verſus corpus, per rectam radius motum
continuaret.

Actio vero corporum, quâ in lumen agunt ad hoc attraben-
dum, ſeſe exerit ad diſtantiam ſenſibilem; ut experimento
conſtat.

469.1.

612.

470. Experimentum 2.

Poſitis quæ in experimento præcedenti, ſi diſtantia inter
acies detur circiter quadringenteſimæ partis pollicis, nullum
lumen inter ſimbrias memoratas ſuper charta apparebit, ita
ut, in hoc caſu, totum lumen quod inter acies tranſit verſus
utramque partem inflectatur & formet fimbrias memoratas. Quod clarè indicat chalibem ad minimum ad diſtantiam o-
ctingenteſimæ partis pollicis in lumen agere.

470.1.

TAB. III.
fig. 4.

Actionem illam cum imminutâ diſtantiâ augeri, etiam pro-
batur.

470.1.

613.

471. Experimentum 3.

Poſitis quæin præcedenti experimento, minuatur diſtantia
inter acies; fimbriæ ſucceſſivè evaneſcunt, donec junctis a-

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