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# Title: Qua Continentur De Angulo Contactus & Semicirculi, Disquisitio Geometrica. De Sectionibus Conicis Tractatus. Arithmetica Infinitorum: sive de Curvilineorum quadraturâ, &c. Eclipseos Solaris Observatio (shelfmark Leibn. Marg. 84:2)
# Folio 1, page id 824573315:0085
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=824573315&page=85
# Source image: https://digitale-sammlungen.gwlb.de/content/824573315/jpgs/default/00000085.jpg
# Model: FoNDUE-GD_v2_ft_Leibniz, run 74, 2026-09-06T16:05:13Z — 29 lines, status machine
# Lines: 29 recognised, mean confidence 0.83
# 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.

r
e
c
oani
d
De Sectonibus COnicis
IR A C T A T HS.
Procemium.
uUm Sectionum Conicarum
Cquae dici Tolent) doctrinam
(prout vulso eradi consuerie)
lacis oblcuram animadverte
ram, atqi perplexis admodum
Demonstracionibus involutam:
Tocum illud negocium paulo
attentius apud me perpenden-
dum catui; ut siqua pollem arte rem latisintricatam
quadancenus extricatiorem darem. Quod e in (c.
quencibus (Dirino Favente auxilio) me aliguatenus
allequutum esse contido.
In illum tinem, Conum iplum primo (undle, quae di-
CUntur, Conisectiones ortum erahere existimantur)
accuratius paulo contiderandum duxi; ut inde Coni-
sectionum originem repeterem, carumqi affectienes
c anquam a vero tonte deducerem; Mechodi salteim
qua _ ApolloniuS PeTEXUS, Magnus Geometra dictuS,
ec Polt illum cum Vereres quam Recentiores incc-
dunc, Fonces apperirem; qui in iptIs Derenctrationi
L. L8