350 



CATALOGUE.— 1PBACTICAL ASTIXOKOliy. . 



Godin's mural quadrant. A. P. 1731. 194. 



1733. 36. 

 Elton's instrument for taking altitudes. Pli. 



tr. 1732. XXXVfl. 273. 



By the sun's imase. 



Quereineufs instrument for marine ohscrva- 

 viiiion. A. P. 1732. H. liy. Mach. A. VI.. 



117. 



Lecarlier's universal instrument for altitudes 

 and time. Mach. A. VI. 187. 



Condauiine on an instrument for determin- 

 ing a parallel circle. A. P. 1733. 294. H. 



53. 

 Logan on Godfrey's improvement on Davis's 

 quadrant. Ph. tr. 1734. XXXVIII. 441. 



Catching the sun's image on an arch. 



Grandjean de Fouchy's'machine for manag- 

 ing a quadrant. A. P. 1740. 468. Mach. A. 



VII. 47. 

 A quadrant witli a reflecting telescope. A. P. 



1746. H. 121. 

 Gersten quadrantis muralis idea nova. Ph. 



tr. 1747. XLIV. 507- 

 Art pour diviser les instrumens. f. Paris, 

 pouchy on making a quadrant into an azi- 



muthal instrument. A. P. 1781. 254. 

 E. M- PI. V. Marine. XV. 

 Cesaris de quadrante murali Mediolanensi 



Ramsdeni. 8. R. S. 

 Enc. Br. Art. Astronomy. Quadrants. 

 A mural quadrant. Cavallo, N. Ph. IV. 



pi. 29. fig- 4. 

 On Synesius's astrolabe. M. Inst. V. 34. 



Reflecting Instruments for Angles. 

 ♦Hooke's reflecting quadrant. Animadv. on 



Hevelius. 4. Lend. 1674. 

 Newton's paper on a reflecting instrument 



like Hadley's. Ph. tr. 1742. 153. 

 *Hadley's instrument for taking angles. Ph. 



tr. 1731. 147. 1732. 32. 



Ph. tr. 1734. 442. 



Godfrey seems to have made a reflecting quadmnt before 

 Hadley, 



On a reflecting instrument in the observa- 

 tory at Berlin. A. Berl. 1749- 370. 



It was made by Whitehead, and ser.t over by I looke. 



Segner's catadio])tric sector. N. C. Petr. 



VI. 399. 

 Ewing's improvement on Hadley's quadrant. 



Am. tr. 1. 126. 

 Dollond's addition to Hadley's quadrant for 



maritime use. Ph. tr. 1772. 95. 

 *Maskelyne's remarks on Hadley's quadrant. 



Ph. tr. 1772. 99. 



Inverts the instrument, in order to find the correction for 

 the back observation on shore. 



Carre's im|)rovcment of octants. A. P. 1777. 

 Magellan Description dcs octans et sextans 



Anglais. 4. R. S. 

 MaccUan sur les instrumens circulaires de 



reflexion. 4. R. S. 

 Account of Magellan's nautical instrument. 



N. A. Petr. 1783. I. H. 141. 

 Atvvood's general theory of the inclination of 



direct and twice reflected rays. Ph. tr. 



1781.395. 



Proposes two new arrangements of the specula, for .parti- 

 cular purposes: they give a greater extent of arc than Had- 

 ley's method, but require a nicer adjustment. 



Lexell on Burdett's optical compass. N. A. 

 Petr. 1783. I. H. 111. 



A sextant with points. 



Cassini. A. P. 1788. 706. 



The angles are multiplied. 



Borda's circle true within l"i, or at most 4'f 



Cassini on Borda's circle. A. P. 1790. 6l7. 

 Account of Borda's circle. Conn, des terns, 



1798. 



Ludlam on Hadley's quadrant. 8. 



Coutit Briihl on the investigation of astrono- 

 mical circles. 8. Lond. 1794. R. S. Germ, 

 with additions by Zach. Hind, Arch. I. 

 257. 



