CATALOGUE. — PHYSICAL OPTICS. 



301 



M aycr. Op. ined. 



*Henneit on refraction, and on its correc- 

 tions. Hind. Arch II. 1, 12[). 



Gives .ooo7ao» for the logarithmic difference to be em- 

 ployed in tlie calculation. 



Piazzi's tabic. Bode Jahrb. 1798. 



Makes the retraction 57.2" at 4 5°. 



Kramp on refractions. Hind. Arch. II. S80, 

 499- 



Calculates them according to the true constitutloa of the 

 atmosphere, and finds that they agree with Newton's table, 

 and With Bradley's as far as 90" zenith distance, below this 

 they differ sometimes 30", but agree at the horizon. As- 

 sumes for the effect of temperature a correction far too great, 

 •o as to agree with the Reffactia solis inoccidui. 



Kramp Analyse des refractions. 4. 179B. 

 Kratup. Hind. Arch. HI. 228. 



Mayer's rule agrees in principle with Bradley's. He em- 

 ploys Shuckburgh's expansions instead of Bradley's. 



Ph. ir. 1797. 



The terrestrial refraction was in general ^ of the angle, 

 in one case \-. 



Madge. Ph. tr. 1800. 7l6, 724. 



Found the terrestrial refraction from J to -j^ of the arc, but 

 generally from -j^ to ^. 



♦Laplace Mecanique celeste. IV. 



Brandes on terrestrial refraction. Gilb. XVII. 



129. 

 Takes ^3£ a. mean. 



Irregular Atmospheric Refraction. 

 Near the horizon, or some heated surface. 



Horizontal Refraction. 



Hevelius. See Beams of Light. 

 Cassini on two mock suns. A. P. II. 103. 

 and X. 159. 



January 1093, 34' above and below the sun's centre. 



Cassini on a double sun. A. P. VII. 2. P. ii- 



18. 

 Supposes reflection and refiaction. 



Cassini on the irregularities of the dip. A. 



P. 1707. 195. 11. 89. 

 Malezieux on three suns seen at Sceaux. A. 



P. 1722. H. IS. 



In October, touching each other vertically. 

 Conti on the elevation of the sea on certain 



coasts. A. P. 1743. H. 40. 

 Minasi sopra la Fata Morgana. 8. Rome, 



1773. R. S. Gilb. XII. 20. R.S. 

 Legentil on atmospherical refraction. A. P. 



1774. 330. H. 47. 



The horizontal refraction at Pondicherry was" usually 2' 

 greater in summer than in winter. 



Boscovich. Gilb. III. 302. 



Biisch trartatus duo optici argumentl. Hamb. 



1788. R.S. 



Gilb. III. 290. 

 EHicotton terrestrial re''raction. Am. tr. III. 



62. Nich. I. 152. Gilb. III. 302. 

 Ph.tr. 1795.581. 



D&lby found a difference of 9' 28" in two measures of 

 the elevation of St. Ann's hill. 



Another case of irregular refraction was observed where 

 the sun was warm, and there was much dew. 



Fata Morgana at Reggio. Nich. I. 298. 

 Huddart on horizontal refractions. Ph. tr. 



1797. 29. Nich. I. 145. 



Attributes them to vapours less dense than the air. The 

 curvature of the rays is justly delineated, for the simplest 

 cases. 



Latham on atmospheric refraction. Ph. tr. 



1798. 357. Ph. M. 11. 232. Nich. II. 417. 

 Gilb. IV. 147. 



The clifft of France fifty miles ofiT were seen distinctly at 

 , Hastings, much magnified, and even Dieppe was said to be 

 visible from 5 to 6 in the afternoon ; in July, the weather 

 hot and no wind. 



Monge on the mirage in Egypt, Ann. Ch. 



XXIX. 207. Ph. M. II. 427. Gilb. III. 302. 

 Vince on horizontal refraction. Ph. tr. 1799. 



13. Ph. M. VII. 54. Nich. IH. 141. Gilb. 



IV. 129. 



Additional appearances of inverted images. 



*W(,llaston on double images, Ph.tr. 1800. 

 239- Nich. IV. 298. «Jilb. XI. 1. 



Caused by afmospherical refraction. With satisfactory 

 experiments. Ihe refraction being greatest where the 

 change of density is the most rapid, and less on each side of 



