310 Telescopes—Life of Fraunhofer. 
mounted upon a large theodolite, by means of which he 
measured the deviation of the inflected light. The object- 
glass was twenty lines in diameter ; its focal length was 16.9 
inches, and its magnifying power from 30 to 110. The he- 
liostate was placed thirty eight feet seven and a half inches 
French measure from the centre of the theodolite. The di- 
the subsequent number of tiis Journal. 
M. Fraunhofer likewise applied himself to the study of va- 
rious atmospheric phenomena, such as halos, parhelia, &c. 
which he published in Professor Shumacher’s Astronomische 
Abhandlungen, and of which we have given a notice in the 
last number of this Journal, p. 348. 
Such is a brief sketch of the scientific researches of Fraun- 
hofer, but, valuable though they be, they are in no respect to 
be compared with bis practical labors as an optician, His 
strument was L. 950. Its aperture is nine inches, and its fo- 
cal length 134 feet. His next great work was another achro- 
matic telescope, ordered by the King of Bavaria, and which 
has an object-glass twelve inches in diameter, and eight feet 
in focal length, but it is not yet completed. Although en- 
