

V. An Account of a very extraordinary Effect of Refract 

 tion, observed at Ramsgate, by the Reverend S. Vince, 

 A. M. F. R. S. Plumian Professor of Astronomy and Ex- 

 perimental Philosophy at Cambridge. Communicated by 

 Patrick Wilson, Esq; F. R. S. Edin, 



[Read 5th January 1807 •] 



THE phenomenon about to be defcribed, was feen on Au* 

 guft 6. 1806, about feven in the evening; the air being 

 very ftill, and a little hazy. The tops of the four turrets of 

 Dover Caftle ufually appear above the hill, lying between 

 Ramfgate and Dover ', but, at the above-ftated time, not only 

 the tops were vilible, but the whole of the Caftle, appearing as 

 if it were fituated on the fide of the hill next to Ramfgate, and 

 rifing as much above the hill as ufual. 



Let AB (Plate VIII. Fig. i.) reprefent the termination of the 

 hill £ v y x, w,y, the tops of the four turrets of the Caftle, as they 

 ufually appear. But, at the time above mentioned, befides thus 

 feeing the turrets, the whole Caftle mnr s was vifible, and ap-> 

 peared as if it had been brought over and placed on the Ramfgate 

 fide of the hill, as reprefented in the figure. This phenomenon 

 was fo very fingular and unexpected, that, at firft fight, I 

 thought it to be fome illufion ; but, upon continuing my obfer- 



H h 2 vation, 



