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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 80, page id 1677894601:0090
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=1677894601&page=90
# Source image: https://digitale-sammlungen.gwlb.de/content/1677894601/jpgs/default/00000090.jpg
# Model: FoNDUE-GD_v2_ft_Leibniz, run 74, 2026-09-06T16:05:13Z — 31 lines, status machine
# Lines: 31 recognised, mean confidence 0.91
# Machine transcription. Not an edition. Errors are expected: about 8% character error rate on Latin and French lines, higher on German.
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# After the first blank line: the recognised lines in reading order, one per line.

out of che Cla(s pals chroush a (mall round hole, Or aper-
cure made in a licele Plate ol Lcad, Brals, or Silver, Where
rich the Cilass is to be corered, itrich hole must be no
bioger chan is necellarr for liohe enough co pass chrouoh.
Fior (0 it will render the Object distinct, the Plare in wrhich
cis made intercepting all che erroneous pare oF che Lighe
irhich comes From che Verges ot che speculum AB. Such
an Instrumene ell made if ic be 6 Foor long, (reckonine
che lenoch from che Speculum eo che Prilum, and FhenCC EO
Ehe FOcuS T) ill bear an aperture of 6Tnches ac che Spe-
culum, and magnity becreen ero and chrec hundred cimes.
Buc che hole II here limies che aperture wrich more advan-
eage, chen it che aperture iras placed ac the speculum. IF
che Instrument be inade longer or Phorter, the aperture must
bc in proporcion as the Cube of che square ROOE of ehe
lenoch, and che magnitrins as che apercure. Buc itS COn
veniene chac che speculum be an luch or erro broader chan
ehe apercure ac che least, and chac che Clals of the speculum
be chick, chac ic bend noc in the morkeing. The Prilm FFO
must be no bigger chan is necellarr, and its back sde FO
must noc be quick-silvered orer. For Without quick- silver
ie will refect all che Liohcincident on ic trom chespeculum.
In chis Instrument che Object rill be inverced, buc may
De crected by makcing che square Sides FF and FC oF the
PriIm FFC noc plane buc spherically convex, chac the RayS
may crols as Well betore ther come ac ic as attermards bc-
circen ic and che Fre- Olals. IF ic be delired chac the Instru-
ment bear a larger aperture, char may bc allo done by com
Polins che Speculum oF ciro Glastes wich Wacer Betreen
chem.
AI