CATALOGUE. PRACTICAL ASTROIfOMy. 



351 



Von Zacli on the circles of Borda and Le- 

 noir Hind. Arch. I. 450. 



Peacock's reflecting instrument for measur- 

 ing distances. Repert. I. l63. 



Containing a base. 



Pitt's dendrometer, with and without reflec- 



Lahire's universal micrometer for eclipses. 



A. P. 1717.57. 

 Halley on observations with cross hairs in a 



telescope. Ph. tr. 1720. XXXI. 1 13. 



Cassini invented an oblique hair, to estimate the dilfc- 

 rence of declination, by the diiference of the times of 

 crossing it. 



tion. Repert. II. 238. /- j- . j <■ • 1 . 1 j 



^ , ,• . r .1 J . P„.. wodin s mode or usmg long telescopes, and 



Patterson s adjustment of the quadrant lor b o k ^ 



the back observation. Am. tr. IV. 154 



Repert. XV. 266. ~ 

 Jlendozay Rios's improved reflecting circle. 

 Ph. tr. 1801. 363. Nich. 8. I. 4. 



For multiple measurements. Troughton's circles only 

 multiply the readings : which in some cases must be the 

 best method. 



Steinhauser's catoptric instrument for mea- 

 suring angles. Gilb. XV. 377. 



Fallon's reflecting engymeter. Zach. Mon. 

 corr. VI. 246. 



Wolkiston on the dip. Ph. tr. 



Lomet's addition to the sextant, for aro- 

 static uses. Journ. polyt. IV. xi. 252. 



long tubes of telescopes. Mach. A. VI. 53, 



57. 

 fHadley's proposition respecting telescopes. 



Ph. tr. 1736. XXXIX. 185. 

 Bouguer's hehometer. A. P. 1745. 11. H. 87. 

 Zanotti on a micrometer. C. Bon. II. ii. 347. 

 Passemenl's reflecting telescope applied to 



the quadrant, with a new mode of dividing 



it. Mach. A. VII. 341. 

 Nux's mode of determining the magnitude 



of the stars. A. P. 1762. H. 135. 



By the interposition of semitransparent substances of dif- 

 ferent thicknesses. 

 Charni^res's megameter. A. P. 1767. H. 129. 



E.Walker's improved quadrant. Nich. 8. IV. Novarrc's Gregorian telescope for astrono- 



218. VI. 219- 

 Ward on correcting the sextant for the back 

 observation. Ph. M. XVIII. 123. 



Astronomical Telescopes, and. Telescopic 

 Sights, Micrometers, and Photometers. 



See Optics. 



pouchy on telescopic sights, invented by 



Morin, 1631. A. P. 1787. 385. 

 Hooke in favour of telescopic sights. Ani- 



madv. on Hevelius. 4. Lond. 1674. 

 Hookc's helioscopes. 1676. Lect. Cutl. 



Using frequent reflections. 



Lahire on the places of stars, measured 

 by the micrometer. A. P. 1701. 101. II. 



91. 

 Lahire's wire micrometer for eclipses. A. P. 

 1701. 119. H. 92. 



mical observations. A. P. I769. H. 130. 

 Bradley on the use of the micrometer. Ph. 



tr. 1772. 46. 

 Bernoulli on the rhomboid reticle. A. Berl. 



1773. 193. 

 Jeaurat's iconantidiptic telescope. Ph. tr. 



1779. ISO. 



Representing one erect and one inverted image, coincid- 

 ing at the moment that the object passes theaxis. 



Jeaurat on diplantidian telescopes. A. P. 

 1779.23. II. 33. 



Jeaurat on iconantidiptic telescopes. A. P. 

 1786. 562. 



Kastneron the wires of a micrometer. Com- 

 mentat. Gott. 1779. II. M. 1. 



Herschel's micrometer for the angle of po- 

 sition. Ph. tr. 1781. 500. 



Hcrsfhel's telescopes. See Telescopes, Fixed 

 Stars. 



