246 EXTRAORDINARY EFFECT 
vation, I was fatisfied that it was a real image of the Caftle. 
Upon this I gave the telefcope to a perfon. prefent, who,.upan 
attentive examination, faw alfo a very clear image of the Caftle, 
exactly as I had defcribed it. He continued to obferve it for 
about twenty minutes, during which time the appearance re- 
mained precifely the fame; but rain coming on, we were pre- 
vented from making any further obfervations. Between us 
and the land; from which the hill rifes, there was about fix 
miles, of} feay:and fromthence'to the top of the hill about the 
fame diftance, and we were about) feventy feet above, the fur- 
face of the water. 
Tne hill itfelf did not appear through the image, which, it 
might have been expected to do. The image of the Caftle ap- 
peared very ftrong, and well defined; and although the rays 
from the hill behind it, muft undoubtedly have come to the 
eye, yet fo it was, that the ftrength of the image of the Caftle 
fo far obfcured ‘the back-ground, that it made no fenfible im- 
preffion upon us. Our attention was of courfe principally di- 
rected to’ the image of the Caftle ;. but if the shill’ behind had 
been: at all vifible, it could not haveefcaped our obfervations as 
wei continued to look at it for a confiderable time <7 a. good 
telefcope. liliv stow atjoa ads 
(A PHENOMENON asf this kind I do ‘not remember to have 
feen defcribed; and it muft have been ‘a? very extraordinary’ 
ftate of the air to have produced it. ‘'Itis manifeft, that! a ray 
of light coming from the ‘top of the°hill, muft have come to 
the eye iia curve lying between the 'two curves deferibed by 
the rays coming from the:top and bottom of the Gaftle; in or- 
der to produce the effete: 900 Shyu eat BS oe 
. Ler AB! (Platé VIM. Figs:2.) repretent the Cattle; ‘EG the! 
Cliff (at Ramfgate), BTD the Hill, ‘DC the Sea, E the place 
of the {pectator, Tothe top of the hill) AywE? a ray of 
light coming from the top of the Caftle to the fpectator, 
Bewk 
44 
Rt ay ~ 
