60 Mr, Wollaston’s Obfervations , &c, 
# 
Upon the whole, I think, I may with confidence recom- 
mend fuch an inftrument, as very convenient for fweeping the 
heavens, and pretty well afcertaining the pofition of what one 
difcovers. I have here tranfcribed many obfervations which 
might better have been fupprefled for the credit of the reft 5 
but from them alone it is, that a judgement can be formed of 
the errors to which I was liable (which yet may pofftbly have 
been errors of calculation), and how far fuch an inftrument is 
deferving of any farther recommendation. A larger telefcope 
and greater magnifying power, to vyhich I can apply thefe 
wires, certainly would have been capable of greater accuracy : 
but the field being fmaller, the ftars of comparifon would have 
been the fewer, and the feries of obfervations lefs connected. 
I have at other times ufed it with a Dollond’s eye-glafs, with 
which it takes in a field of nearly three degrees ; but the mag- 
nifying power is then fo much the lefs, that, for this kind of 
obfervations, I prefer that of Ramsden, with which I can 
obferve ftars down to what I call the tenth or eleventh magni- 
tude, and, I think, with fome degree of precifion* 
Chiflehurft, Nov, 1 8, 1786, 
