1^6 Mf.ViGoi:T''^Ohfcrvailons, &c. 



tudes, and for that purpofe had in 1776 divifions engraved on 

 the eye- tube of a refractor; but faund that its high magnify- 

 ing powers prevented ftars of the firfl: and fecond magnitude 

 becoming invifible. 



Laflly, I am inclined to think the following method practi- 

 cable, viz. to rcfle61: in a telefcope, by means of an illumina- 

 tor, different degrees of light in a known proportion, fo that 

 flars of all magnitudes may be obliterated. 



The changeable flate of the weather will perhaps be thought 

 a confiderable obftacle to thefe contrivances, and to throw doubt 

 >Gn the obfervations ; but this may be fufficiently obviated by 

 attending to fmall tclefcopic ftars, which according to the 

 clearnefs of the atmolphere are more or lefs difl:in6tly feen« 



I beg the favour of you, dear Sir, to prefent thefe obferva- 

 tions to the Royal Society ; and believe me, with the greateft 

 regard, &c. 



York, Dec. 5, 178.1. EDWARD PIGOTT. 



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