# Leibniz Legible — https://leibnizlegible.com
# Page: https://leibnizlegible.com/page/727094130:0024
# Permalink to this reading: https://leibnizlegible.com/page/727094130:0024?run=74
# Title: Optica Promota, Seu Abdita radiorum reflexorum & refractorum Mysteria, Geometrice Enucleata (shelfmark Leibn. Marg. 94)
# Folio 12, page id 727094130:0024
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=727094130&page=24
# Source image: https://digitale-sammlungen.gwlb.de/content/727094130/jpgs/default/00000024.jpg
# Model: FoNDUE-GD_v2_ft_Leibniz, run 74, 2026-09-06T16:05:13Z — 71 lines, status machine
# Lines: 71 recognised, mean confidence 0.81
# Machine transcription. Not an edition. Errors are expected: about 8% character error rate on Latin and French lines, higher on German.
# Licence: CC BY 4.0, Leibniz Legible. Machine output: do not ingest it as verified text; keep this provenance with the text.
# Wording rule: say "the machine reads it as …", never "Leibniz wrote".
# After the first blank line: the recognised lines in reading order, one per line.

Resractiones a Vicellione observata es earum a nostra
Calento Discrepantia.
Calct. Differ
Refractiones vieri ex Refractiones vitri ex
aere.
agua.
Bosero ) Calcul. )Differ. Observ.  Calc. ( Diff.
2 25) 2 22 7030003 20 + 2000 30,OF 12) + 4
+ 30. 4 50i 2006 3006 48) + 180L 3002 27+ 572c
et 1 36(0 020 3010 3000 0003 00,C3 50) + 503C
O10 52). 28150014 35 = 2505 0005 26 = 28 4C
O24 6
5420 0019 14) = 46,07 3007 3000 00,5C
19 3018 29u 6525,3024 40  5010 3010 12 = 28 6c
24 3024 2 = 293F 303C 08 = 22 24 0054 02) + 02 7C
51.+
65(38 0-38 58+ 5428 00,19 34 + 94(8c
Refractiones ab Achanasio Kerchero obsorvata,  secundum
set. ob
Methodum nostram Calculata cum Differentiis.
Refractiones vini. Refractiones olei. I Refractiones vitri.
diff. (Obser. I Calc.  Diff. Obser. ) Calc.) Diff. Obser. ICalc. ) Diff.
ut
2 30 2 28) n 2 2 50 2 33  17 3 103 27 + 17
4 45 5 3  10 5 10 5 12) ut 2 6 40 7
1  21
y 50 7 500 0 8 4 8 4 0 020. 50(20 50), 00
420 59) in 5II 5O(TI 28) i 3225
815
2 
42)25 10(14 42) un 29,26 10(25 5) 65(20 2219 48)  24
50(19 50(29 22) i 3820 20)29 42)  3825 50(2520) i 30
1424 50(24 50 0 025 12(25 25) + 1331 203E. 54  44
d9130
10132
8 = 21030 54(32 36 4+ 204(38 1039 43 4 93
Ane inci) Refractiones a-)
dentiae in quae ex Aere.
aer
disterentem ad tracto 6. 23, I): aleue
itd Lguc o  ob tem tet
vancia, ob has rationes; Primo enim, lacis apparer in oblerva-
tion bus Vicellionis cum oblervasse cancummodo ad graduum le-
misses; FC (uc nocac Keplerus in Astron. Opt. fol. T16.) cercum
est luis ab experiencia capris retractionibus, manum admovisse, ut
inordirem illas, per secundorum incrementorum aequalitem, re-
digerer: Omnia enim harum obtervacionum incrementa Purgune
per difterenciam 30. In Keccheri aurem obserracionum difte-
niS 2: 223
te
5
L5
O3L
2L
30
Refractiones aquae.
 20) 2 2G
e2
15
5019 40 18) 50
1030
4 38) 4 50 + 18
0. 7 40 0 0
910 45 = 24 LF.
624 25
2
33
a
0(24 40 24
431
rCLS