296 JMifcellanea Curio fa. 



dy there be not any) fome little Stone Walla 

 or like Place, on which to fix the Eye-glafs, 

 fo as to anfwer that Objed-glafs : And ha- 

 ving lb adjufted it, as through both to lee 

 that Star in its defired Station, (which may bell 

 be done while the Star is to be feen by Night 

 in f >ch fituation, near the time of one of the 

 Solftices), let it be there fixed fo firmly, as 

 not to be difturbed, (and the place lb fe- 

 cured, as that none come to diforder it), 

 and care be taken fo to defend both the 

 Glaffes, as not to be endangered by Wind 

 and Weather. In which contrivance I am 

 beholden to Mr. John Gafwel M. A. of Hart - 

 hall in Oxford, for his Advice and Aflift- 

 ance j with whom I have many Years fince, 

 communicated the whole matter. 



This Glafs being once fixed (and a Mi- 

 crometer fitted to it, fo as to have its Threds 

 perpendicular to the Horizon, to avoid a- 

 ny inconvenience which might arife from 

 diverlity of Effraction if any be) the Star 

 may then be viewed from time to time (for 

 the following Year or longer) to fee if any 

 change of Azimuth can be obferved. 



This I thought fit to recommend to your 

 Conrlderation, who do fo well underftand 

 Tdefcopes, and the managery of them ; not 

 knowing any who is more likely to reduce 

 it to Practice. If you fhall think fit to give 

 your felf the trouble of attempting the Ex- 

 periment, and that it fucceed well, it will 

 be a noble Obfervation, and worth the La- 

 bour : And, if it fhould'mifcarry, the charge 

 I hope woqld not be sreat* 



< ; :■ ' Bill*, : : . , .. i 



m 



