CATAtOGJJE. — PRACTICAL ASTRONO^T. 



347 



Lagrange on taking the mean of observa- 

 tions. M. Taur. 1770. 3. V. ii. 167. 



Lagrange on the simplest mode of express- 

 ing a given number of facts. A. P. 1772. 

 i. 513. H. S3.. 



Euler on Lagrange's mode of taking a mean 

 of observations. N. A. Petr. 1785. III. 

 289. 



Bergmann on interpolations in astronomy. 

 Opusc. VI. I. 



Lcrgiia Principi di geografia astronomico- 

 geonietrica. Verona, 1789- K. S. 



Vince's practical astronomy. 4. Lond. 1790. 

 R. S. 



Treinbley on taking a mean of observations. 

 A. Berl. 1801. M. '29- 



Astronomical Apparatus, in gene- 

 ral. 



See Geometricallnstruments. 



Htvelii organographia astronomica. f. Ghent, 



1G73. 



Acc.Ph.tr. 1673. 6150. 

 Hooke's animadversions on Hevelius's ma- 

 china coelestis. 4. London, 1674. Lect. 



Cutl. 

 Maskelyne's remarks. Ph. tr. 1764. 348. 

 Due de Chaulnes on the improvement of 



astronomical instruments. A. P. 1765. 



411. H. 65, 

 Magellan Trait^ sur dcs in&trumens d'astro- 



mie. 

 E. M. PI. Vn. Astronomic. PI. 15. 

 Ludlam on Bird's method of dividing. 4. 



Lond. 

 Montucla and Lalande. IV. 334. 



Troughton on some astronomical instru- 

 ments. Zach. Mon. corr. II. 907 



Obscrvatorin. 

 Godin's convenient observatory. Mach. A. 



VI. 49. 



Bouin's trap door for an observatory. A. P. 



1763. H. 148. 



Barker's account of tlie observatory at Be- 

 nares. Ph. tr. 1777.598. 

 Schulze on the situation of an observatory. 



A. Berl. 1777- 223. 

 Williams's particulars of the observatory at 



Benares. Ph.tr. 1793.45. 

 Ussher on the observatory in Dublin. Ir. tr. 



1787.1.3. 

 *Piazzi della specola astronomica de'regi 



studi di Palermo, f. Palermo, 1792. 4- 



R. S. 



Ace. Hind. Arch. I. 257. 



Time. 



Equation of time. 



Lalande on the equation of time. A. P. 1762- 



131. H. 120. 

 Maskelyne on the equation of time. Ph. tr. 



1764. 336. 



Pemberton. Ph. tr. 1772. 434. 



A problem relative to the calculation. 



K'astner on reductions of time, A. Gott. D. 

 Schr. 101, 194. 



Equation Clocks, for Solar Time. 



P. 



Lahire's clock, showing true ti.ne. A 



1717-238. 

 Leroy's solar clock. A. P. 1717. H. 85, 



Mach. A. III. 151. A. P. 1728. H. 110. 



Mach. A, V. 63, 



