isS tlhtory of Astronomy for the Year 1S06. 



8vo., which is the completest and most extensively kno'vn 



of all. 



The necessity of our procuring good instruments without 

 the assistance of the English, has determined government 

 to place pupils with our own most intelligent artists. 



The exhibition of our national industry, which took place 

 this year under the auspices of M. Champagny, minister of 

 the interior, has made known a multitude of important sub- 

 jects which were hitherto unknown. M. Le Noir, one of 

 our best enguieers, exhibited an azimuth circle, an equa- 

 torial, a repeating circle, a circle of reiicction for the n.nvy, 

 a variation compass, an inclination compass : all these in- 

 struments made with his own haudi;. He also exhibited 

 an instrument, by M. Rochon, for reducing distances at 

 sea; a level of a new construction; two circles for finding 

 the horizontal and the vertical angles ; a micrometer formea- 

 Surinti; the distances of fyr removed objects ; a smaller and 

 more convenient graphometer than any yet used ', an armil- 

 lary sphere, which gives the true time and the mean time; 

 an astronomi,cal ring; a new compensation pendulum made 

 with glass and copper. 



M. Lcrebours in optics, and M. Jcker in naval instru- 

 ments, also contributed to this exhibition. 



We have distinguished some fine pieces in clock- and 

 watcli-work by Messrs. Brcguct, Lepaute, Janvier, Pons, 

 &c.: of these a detail has been given in the catalogue of the 

 exhibition, and in the Moniteurs of the 26th of October and 

 12th of December 1806. 



I sent to Home a circle rpade by M. Belet, and a pendu- 

 lum by M. Pons, the precision of which v;as much admired 

 by the Italian astronomers. 



M. Zeichenbaoh at Munich, and Baumann at Stutgardt, 

 make very fine instruments. With the repealing circles of 

 the latter one may take observations by himself alone, by 

 means of a lead wire placed in the inside of a hollow cylin- 

 drical axis, according to the idea of M. Bohnerberger. 



M. Mendelssohn, at Berlin, makes sextants with very great 

 exactitude. 



The 



