300 



GATALOGUK. PHYSICAL OPTICS* 



Euler on atmospheric refractions at different 

 teaiperatures. A. Berl. 17.'54. 131. 



Euler on terrestrial refraction. A. Petr. I. ii. 

 129. 



La Cailie on refractions. A. P. 1755.547. 

 H. 111. 



Thinks that it is nearly the same throughout the tempe- 

 rate zones. 



Lumbert Route de la lumiere par les airs. 8. 

 ■ Hague, 1758. 

 Lambej-t on the density of the air. A. Berl. 



1772. lOS. Roz. XVIII. 126. 

 Heinsius on northern refraction. N. C. Petr. 

 VII. 411. 



At Olenek, lat. 73° 4', certainly not greater than in Cas- 

 »ini'i tables, which give 6' 23" at 8° 3o' altitude. 



*Simpson Math, dissert. 



Lemonnier's proposal for observations on 



refraction. A. P. 1766. 6O8. H. 104. 

 Lemonnier on horizontal refraction at sunset. 



A. P. 1773.77. H. 53. 

 lemonnier. A. P. 1781. 



Found a horizontal refraction of 50' in verycold weather. 



Lagrange on astronomical refractions. A. 

 Berl. 1772. 259. 



A formula like Simpson's. 



Kastner on refraction. N. C. Gott. 1772. 



III. 122. 

 Cassini on refractions. A. P. 1773. 323. H. 54. 



Thinks that they are somewhat greater at equal altitude! 

 «n the south side of the zenith than on the nortti. 



Legentil on atmospherical refraction in the 

 torrid zone. A. P. 1774. 330. H. 47. 



Legentil. A. P. 1789. 224. 

 Fmds the horizontal refraction a'.S less in India than in 



France. 



Table of refraction for the coast of Coro- 



mandel. A. P. 1774. 399- 

 Dionis du Sejour on the effects of refraction 



in eclipses. A. P. 1775. 265. 

 Attributes a refraction of about 5" to the lunar atmo- 

 sphere. 



Dignis du Sejour on the curve described by 



light in the atmosphere ; upon the optical 

 hypothesis of its density. A. P. 1776. 273. 

 Maskelyne. Ph. tr. 1777- 7'22. 



The terrestrial refraction is equal to the angle subtended 

 by about l of the distance of two objects ; in order to cor- 

 rect for the joint effect of curvature anJ refraction, we may 

 divide the square of the distance by i of the diameter of the 

 earth. 



Bradley's rule for refraction. Maskelyne. 

 Ph. tr. 1787. 156. 



At 45° 3' 57", correcting for the temperature in the 

 ratio of 400 to 350+f^, and for the barometerin the ratio of 

 its height to 2g.O inches. But even from some observations 

 here insetted, this correction for temperature appears to be 

 too great. At 45°, Maskelyne makes the refraction 56". 5, 

 from another comparison of observations 55". 8; Lord Mac- 

 clesfield 54". 6, which agrees exactly with Hawkskee's ex- 

 periment ; La Cailie 06". 0, which is much too great. 

 Maskelyne recommends that a table of refractions be made 

 for each instrument by immediate observation. 



Ilerschel. Ph.tr. 1785. 88. 



Found that t, 20, Sagittarii appeared to form a spectrum 

 measuring 18" g'" vertically, s" 35'' horizontally, the dif- 

 ference 7" 34'", near the meridian, 4th May 1783. 



The altitude mUst have been about 4°, and the refractioi* 

 2l', the declination being 34° 27'|. 



A. P. 1787. 355. 



The terrestrial refraction was found equal to ^ of the 

 angular distance. 



Roy on terrestrial refraction. Ph. tr. 1790. 

 233 Gilb. III.281. 



Found it vary from i to ^ of the angular distance. Bou- 

 guer made it ,, Maskelyne -^, Lambert Jj. A correction 

 for temperature is given in a note by Dr. Maskelyne, but 

 there is some mistake in it. 



Oriani Ephem. Milan. 



Cagnoli on refraction. Soc. Ital. V. 259. 



At Verona J^ less than in Bradley's tables, and agreeing 

 with those of Oriani. 



Zanotti. C. Bon. VII. O. 1. 



Finds the barometrical and thermometrical corrections of 

 little use. 

 Deluc on refractions. Roz. XLIII. 422. 



Principally on the correction for temperature. 

 Dalby. Ph.tr. 1795.581. Gilb. III. 281. 



The terrestrial refraction varied from \ to ^, but was ge- 

 nerally ^ of the arc. 



