S54 



CATALOGUE. — PKACTICAL ASTRONOMY. 



Deparcieux. A. P. 1748. 313. H. Il6. 

 Shorten Serson's top. Ph. tr. 1751. 352. 



Remained 1 5' perfecdy horizontal. 



Chezy. S. E. V. 254. Nich. III. 396. 



Ratenfay. A. P. 1772. i. 



Ferguson. Mech. exerc. 115. 



Meister on the spirit level. N. C. Gott. 1776. 



VII. 142. 

 Deluc. Roz. IX. 204. 

 Carayon's water level. Roz. XI. 368. 

 A circular spirit level. Dollond. Ph. tr. 1779. 



332. 

 Inochodsoff. A. Petr. III. i. 188. Roz. XXVI. 



461, 

 Fouchy on a level not requiring adjustment. 



A. P. 178 J. 82. H. 44. 



The surfaces of the liquid in different branches of a tube 

 are viewed through a telescope at the same time with the 

 object. 



Ducaila Expression des nivellemens. 1782. 

 By drawing horizontal lines on a map. 



Jonville's instrument for measuring the incli- 

 nation of strata. Roz. XXX. 100. 



Keith's mercurial levels. Ed. tr. II. 14. IV. 

 H. 17. Repertory. III. 338. IX. 49. 

 With sights. 



Ph. tr. 1793. 67. 



The level of Shuckburgh's equatorial instrument moves 

 ' of an inch for each second. 



Enc. Br. Art. Levels. 



Nicholson. Nich. I. 131. 



Anderson's instrument for levelling. Repert. 



11,317. 

 Walker on the plumb line and spirit level. 



Nich. 8. I. 309. '^ 



Little's artificial horizon. Ir. tr. VIII. 77. 



Repert. ii. II. 183. 



With a weight. 

 Gould's patent artificial horizon. Repert. ii. 



1.98. 

 Churchman on levelling. S. A. XXII. 224. 



After Ducaila. 



Modes of fixing Instruments. 



Hooke on fixing instruments. Animadv. on 



Hevelius. IjCCt. Cutl. 

 Gray on finding a meridian from the pole 



star. Ph. tr. 1701. XXII. 815. • 

 Derham. Ph. tr. XXIV. 1578. 



Mentions " the thill horse" of the wain as coming te 

 the meridian at the same time with the pole star and the 

 bright star in Cassiopeia's thigh. 



Rittenhouse's mode of fixing a meridian. Am, 



tr. II. 181. 

 Patterson on a meridian line. Am. tr. II. 



251. 

 Schubert on fixing a meridian. N. A, Petr. 



1788. VI. 301. 

 Kastner on observations of the pole star. 



Commentat. Gott. 1791. XI. M.L 

 Henry on adjusting a transit instrument, 



Zach. Mon, corr. III. 344. 

 On drawing a meridian line. Zach, IV^on. 



corr. III. 419. 

 On a meridian drawn at Gottingen by ob- 

 servations on glass globes. Zach. Mon, 



corr. VII. 553. 



The pole is situated where the line drawn through the 

 pointers meets the line drawn from the last horse of the 

 wain to the pole star. 



Observations in general. 



Correctiom. 

 Refraction. 

 Refraction. See Physical Optics. 

 Kastner on corrections for refraction, N. C. 



Gott. 1772. III. 122. 

 Cassini on observations of refraction. A, Berl, 



1773,251, 

 Dollond's apparatus for correcting refraction. 

 Ph.tr. 1779.332. 



Two lenses sliding on each other, placed before the object 

 glass. Why better than a table .' 



Smeaton's mode of correcting for refraction. 

 Ph, tr, 1787. 318. 



