i/'.Newtoo's lemr to the TuhUj}jer of March 2 6. 1677. contain, 
ingfime more ftiggeftmu about bts New Telefcope^ and a Table 
^ rf-Apetmm am Chzrgti for the (everal Lcngihs of that Im 
JirumenL 
S I Rj 
Ince my bft Letter I have further compared the two Te- 
. iefcopes, and find that of Meul to reprelent as well the 
.,.00033$ neerer Objeas^ioaiethingdiftind^er than the other, 
Byt I ffluft teil you aifo.ihat I am not very well affured of the 
goodnefs of that other, which I borrowed to make t4ie Coni- 
parifoa^and therefore defire^tliat the other Experiment fliould 
be rather confided in, of reading ac the diftance of between 
a 100 and i2o foot^ at which I and others could read with it 
inthQTranfaSions^ as I found by meafure : At which time 
toe apertare was If- of an Inch; which I knew by trying, 
that an obftacleof that breadth was reqaifite to intercept all 
the iighr^ which came from one point of the objea. 
I fiiould tell you atfo^ that the little plain piece of metall, 
next the eye-glafs, is not truly figured : whereby it happens, 
that objeas are not fo diftindJ: at the middle as at the edges, 
.Andf hope^ that by correding its figure, (in which I find 
iBore difficulty than one would expedfj they will appear all 
m€T^Mn(kii and diftinderin the middle than at the edges. 
And I doubt n-ot but that the performances will then be 
i^rester« 
But yet ! find^that there is more light loft by refledion of 
#e metall which I have hitherto ufed, than by tranfmiffion 
through gfaffes : for which reafon a fliallower charge would 
probabiy do better for obfcure obje<9:s 5 fuppofe fuch an one^ 
as would make it magnifie 34 or 32 times. But for bright 
obteas at any diftance^ it feems capable of magnifying 38 or 
40 times with fufScient diftinftnefs. And forallobjeds^the 
fame Charge^ i believe, may with advantage be allowed^ if 
the fteely matter^ imployed zt London, be oaoce ftrongly re* 
ie£l:ive than this which I have ufed. 
The petformances of oue of thele Inftruments of any length 
hdnsy koowni it wii appear by tliis fallowing TMe.v^lm may 
