aio Mifcellanea Curio fa. 



jufl Emerging out of, or rather continging 

 the Species of the Wall, (the Pofition of the 

 Telefcope being regulated by a fine Hair ex- 

 tended in the Focus of the Eye-glafs) I am 

 aOiir'd that the Limit of the fhade may be 

 obtain'd to the utmoft Exactnefs: And of 

 this I defign to give a Specimen by an Obfer- 

 vation to be made in June next, by the help 

 of the high Wall of St. Paul's Chuich, Lon4 

 don, of which fome following Tranfadion 

 may give an Account. In the mean time 

 what I have premis'd may fuffice to fet others 

 at work, where fuch or higher Buildings are 

 to be met with. I mall only Advertife, that 

 the Winter-Tropick by this Method may be 

 more certainly obtain'd than the Summer's, 

 by reafon that the fame Gnomon does afford 

 a much larger Radius for this manner of 

 Obfervation- 



A 



