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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 75, page id 1677894601:0085
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mighe Telescopes be broughe eo sufticient perfection, wereit
noc For chedifferent retransibilier of sererallors oF RayS. BUE
by realon oFchis different retransibilier, I do noc rec lec any
Ocher means of improvins Pelescopes by Retractions alonc
chan chac ot increasine cheir lenechs, For which end che late
contrirance oF FIurenius seems well accommodated. FOr
very lons Tubes are cumbersome, and scarce to be readily
managed, and by reason ot cheir Length arC VerY apE EO
bend, and Phake by bendins (o as to cause a continual
cremblins in che Objects, whereby ic becomes difticule t0
lec them distinctlr: Wrhereas by his contrirance che Clastes
are readily manascable, and che Object. Clals beins fxc uP-
On a srong upriehe Pole becomes more ceddr.
Sccins cheretore che improvement of lelescopes of siven
lenochs by Retractions is desperare; I contrired herecotore a
Perspectire by reflexion, uling instead of an Object Olals
2 concare Metal. The diameter of the Sphere eo which
the Mecaliras ground concare as about 25 Englichr Inches,
and by consequence che lenoch of che Instrumene abOue sIX
Inches and a gnarter. The Eye-Olals was plano- COnVeK,
and che Diamerer of the Sphere eo which the conrex side Was
oround as aboue : OF an Inch, or a licele less, and by con-
sequence ic magnihed between z0 and +o times. BY ano-
cher ray ot meaturins l Found chac ic magnitied aboue
25 cimes. The Concare Nletal bore an aperture ot an Inch
and a chird pare; buc che aperture ras limired noc by an
opakce Circle, corerins the Limb of the Necal round abouL,
but by an opalce circle placed becween the Fye- Clals and che
Fre, and pertorated in the micdle wich a licele round hole
For che Rars co pass chrough co the Fyc. For chis Circle
by being placed here, sope much ot che erroneous Lighe,
Wrhich ocherrise rould have disturbed che Vision. BY com-
Parins ic wich a pretey 800d Perspectire of Four Feer in
2 2
lenseh,