OF THE SUN WITH THAT OP THE FIXED STARS. 



25 



Appendix. 

 I. Observations of a reflected image of the Sun, compared with a similar 



image of a Candle. 



The sun's image, reflected from a thermometer-bulb filled with mercury, is 

 viewed from a distance by the observer through a telescope, with power 36, 

 and two yellow glasses at the eye-piece. The image of a candle, reflected 

 from a similar bulb, is viewed through a lens of from 2 to 2i inches focus ; 

 and the distance of the candle is varied, until its image appears of equal 

 brightness with the image of the sun. 



II. Observations of Sirius, compared with a reflected image of a Candle. 



Sirius is viewed by the observer through a telescope, with power 36, and two 

 yellow glasses at the eye-piece. The image of a candle, reflected from a ther- 

 mometer-bulb filled with mercury, is viewed through a lens of from 2 to 2i 

 inches focus ; and the distance of the candle is varied, until its image appears 

 of equal brightness with that of Sirius. 



III. Observations of u Lyrse, compared with a reflected image of a Candle. 



1827, April 9 



.26 



276 



2.5 



MDCCCXXIX. 



