CATALOGUE. — OPTICAL INSTRUMENTS. 



287 



KliDgenstierna on refraction. Schw. Abh. 



1754. 300. 

 ♦Clairaut on the improvement of telescopes. 



A. P. 17o6. 380. H. 112. 1757. 524. H. 



153. 1762. 578. H. 160. 



Finds the index of refraction of plate glass from 1.54 to 

 1.S6 : of flint 1.5S5 to l.flis ; the dispersion of water 

 equal to that of plate glass : thinks the colours dilTerently 

 diatributed by different mediutns. 



Legentil on the aberration of light passing 

 through two lenses. A. P. 1757. 545. 



Legentil on binocular telescopes. A. P. 1787. 

 401. Roz. XXXI. 3. 



Recommending them. 



"Redern on object glasses. A. Berl. 1759. 



89. 1760. 3. 1761. 3. 

 J. A. Euler on object glasses with water. 



A. Berl. 1761.231. 

 Beguelin on achromatic prisms. A. Berl. 



1762. 66. 



Beguelin on the improvement of telescopes. 

 A. Berl. 1762.343. 



♦Beguelin on telescopes. A. Berl. 1769- 1. 



Beguelin on Aepinus's achromatic micro- 

 telescope. A. Berl. 1784. 11. 40. 



Murdoch on achromatic refraction. Ph. tr. 



1763. 173. 

 Defends Newton. 



Fougeroux on Campani's object glasses. A. 



P. 1764.251. H. 169. 

 P. Dollond on achromatic telescopes with 



triple object glasses. Ph. tr. 1765. 54. 

 D'Alembert on achromatic telescopes. A. 



P. 1764. 75. H. 175. 1765. 53. H. II9. 



1767. 43. H. 153. 

 D'Alembert Opuscules, vol. I. A. Berl. 1769. 



254. 

 Acknowledges some mistakes of his own and of Clairaut. 



Lagrange's dioptrical formulae. M. Taur. 



in. ii. 152. 

 Lagrange on the theory of telescopes. A. 



Berl. 1778. l62. 



Cotes's theorem. 

 Boscovich on achromatic glasses. C. Bon. V. 



ii. 265. Germ. 8. Vienn. 1765. 

 Due de Chaulnes on achromatic lenses. A. 



P. 1767.423. H. 162. 

 Scherfer on dioptrical telescopes, by Hardy. 



8. 1768. 



Darquier on the focus of telescopes. S. E. V. 



367. 

 Zeiher de novis dioptricae augmentis. 4. 



VVittenb. I768. 

 Jeaurat on the refraction and dispersion of 



crown glass and flint glass, with tables 



for object glasses. A. P. 1770. 461. H. 



103. 

 Lambert on achromatic telescopes of one 



kind of glass. A. Berl. 1771. 338. 

 Rochon's achromatic telescope. A. P. 1773. 



299. Gilb. IV. 300. 

 Rochon on reflecting telescopes. Ph. M. II. 



19. 170. 

 Navarre's telescope. A. P. 1778. H. 56. 

 Ftiss sur les telescopes. Germ, by Klugel. 4. 



Leipz. 1778. 

 Telescopic appearances of the stars. Her- 



schel. Ph. tr. 1782. 82. 

 Herschel on the magnifying powers of his 



telescopes. Ph. tr. 1782. 173. 

 Herschel on the front view of the reflecting 



telescope. Ph. tr, 1786. 499. 

 Herschel on the magnitude of the optic pen- 

 cil. Ph. tr. 1786. 500. 



A pencil of j^ of an inch was sufficient for distinct 

 vision with a high magnifying power. Suspects that the 

 aperture ought to be in a certain ratio to the focal length, 

 even in a large telescope. 



*Herschel on his forty feet telescope. Ph. 



tr. 1795. 347. 

 Herschel on darkening telescopes. Ph. tr 



Mich. 8. 1. 224. 

 Herschel on the action of mirrors. Ph. tr. 



1803. 214. Nich, 8. V. 304. 



