80 A. Clark on the Sun and Stars photometrically compared. 
ciency, cannot fail to find our glorious luminary a very small 
star; and to the human understanding, thus enlightened, more 
than ever, must the heavens declare the glory of God. 
P. S—Since the above had left my hands for the press, I 
prepared a close covering for the vertical opening to my 
chamber, with a circular perforation, subtending at the prism 
an angle of 32’; and substituted for the little lens one having 4 
ocal distance of one-eighth of an inch. By this arrangement, 
with the mirror placed above, and an eye-hole by its side, the 
sun i would be directed upon the prism, or just beside it, at 
ure. 
I ea ae that when the pencil was made to fall entirely out- 
side of the lens, I was viewing a portion of the sky just eq 
in form and area to the sun itself, close by its side. 
Allowing the direct light to pass centrally over the prism, I 
found the image visible for more than one minute after the last 
irect ray from the sun had left the line of the lens, although 
reduced nearly 22,000 times. 
er proceeding thus far, it appeared to me, that could the 
sun be reduced to a minimum vosibile, without. reflexions, and 
the lenses so arranged that both eyes could be penplopess in ob- a 
serving, the resuits would be more satisfactory 
By removing the object-glass, eight eakeers in diameter, from 
the tube of my arma and pivnné a lens in the eye-tube, 
one-twentieth of an inch in distance, and turning the eye 
end toward the sun, with the eyes 100 inches from the lens, I 
obtained such a view as the sun would present if removed 2,000 
jc _ present. ene nce. ‘To accomplish the further necessary 
o-ling tube carrying a lens 4 : 
without a screen, while aids a cae aes soa of the 
res som shes the mirror into the prism. Seated 
observing chair, with the oe clock 
sting te es te math of be ery ears, and 
