< 4032 ) 
^r.Ne wton's tetter the Tuhlijher ef March 26.167 2. contain- 
zngfome more fu^eji ions about his New Tele [tope ^ and a Tabic 
<^Apercures^«.^ Charges /ir/^^ jeveral Lengths 0/ that Im 
jtrument^ 
SIR, 
Since my laft Lector I have further compared the two Te- 
lefcopes, and find that of Metal to reprefent as well the 
Moon,as neerer Objecfis^ (omethingdiftinder than the other. 
But I muft tell you alfo/hati am not very well aflurcd of the 
goodficfs of that other, which 1 borrowed to make the Com- 
parifoo^and therefore defirCjthat the other Experiment fliould 
be rather confided in, of reading ac the diftance of between 
a 100 and 120 foot^ at which I and others could read with ic 
in thcTranfaSiom^ as I found by meafure : 'Ac which time 
the aperture was i|-of an Inch 5 which I knew by trying, 
that an obftacle of that breadth was requifice to intercept all 
che lighCj which came from one point of the objed. 
I fliould tell youalfoj that the little plain piece of metall, 
next the eye- glafs, is not truly figured : whereby it happens, 
that objects are not fo diftin<3: at the middle as ac the edges. 
And I hope, that by correding its figure, (in which I find 
more difficulty than one would expedf,^ they will appear all 
overdiftin^t, and diftin<flerin the middle than at the edges. 
And I doubt i>ot but that the performances will then be 
greater. 
But yet T find,that there is more light loft by refledion of 
die metall which I have hitherto ufed^ than by tranfmi/Eon 
through gjafles : for which reafon a fliallower charge would 
probably do better for obfcure obje^s jfuppofe fuch an one, 
as would make ic magnifie 34 or 32 times. But for bright 
objeds at any diftance, it feems capable of magnifying 58 or 
4D times with fufficientdiftinftnefs. And for all objecasythe 
fame Charge, I believe, may with advantage be allowed, if 
thefteely matteTj imployed at London, be more ftrongly rc* 
fleClive than this nvhich I have ufed* 
The performances of oae of thefe Inftruments of any length 
feeing known^ it will appear by tto following T^^//-, what may 
be 
