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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 78, page id 1677894601:0088
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=1677894601&page=88
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thins buE 2 800d Artist co brins che desion to Pertection.
For the Clals being irroughe by one ot our London Arcicts
atter such 2 manner as cher grind Classes For Telelcopes,
tho ic scemed as Well rouche a5 che Object Glastes ule 10
be, vec when ic as quick- silrered, che reflerion dilcorered
innumerable Inequalities all orer che Clals. And by reason
ot chese Inequalicies, Objects appeared indictinet in chis In-
ATUeHE. FOr the Errors ot reflected Rays caused by any
Inequalier ofche Clals, are aboue lix times oreater than the
Frrors ot retracted Rays caused by the like Inequalicies. Yet
by chis Experimene I Pacisfied my selF thac the refterion on
the concare side of che OlaIs, Which I Feared ronld disturb
che rision, didno sensible prejudice ro ic, and by consequence
chac nochins is mantins to pertect chele Telelcopes, bue
oood Wortemen uho can grind and polith Glasses cruly sphe-
rical. An Object Clals ot a tourtcen Foor Telescope, made
BV one et our Pondon Artificers, I once mended considera
bIy, by crindins ic on Dicch wich Puter, and leanins ve-
ry casily on ic in che grinding, lest che Pucer Phould Scrarch
ic. Whecher chis rar mas nov do ell enouoh For polistr
ins chele reflecting Clalles, I have noc vet cried. Bue he
chat Phallery cicher this or any ocher rar of polictrinq wrhich
he mar chink becter, may do well eo make his Clasles rer
dy For polictrins by grinding chem wichour chac violence,
Whererich our London Workmen prels cheir Clasles in prind-
ing. For by such riolent presture, Cilasses are ape eo bend
2 licele in che grindins, and suchbending will cerrainly spoil
their Figure. Po recommend cherefore the consideration
oF these reflectins Glasles, to such Artists aS are CuriOUS IH
tixurins Classes, I Phall deseribe chis Oprical Instrument ip
che Collowins Propotuion.