282 



CATALOGUE. — OPTICAL INSTRUMENTS. 



Photometers. 



Bouguer Traite d'optique. 



B'ougueron the measurement of light. A. P. 



1757. 1 H. 145. 

 Celsius on the measure of light. A. P. 1735. 



H.5. 



Confirms Bouguet's estimate of the moon's light as 



15^ of 'hat of the sun. 



*Lanibert Photometria. 8. R.I. 



Nux's mode of determining the magnitude of 



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



By viewing them through semitransparent substances of 

 diflPerent thicknesses. 



Priestley's o[)tics, vi. §. 7. 



Fontaiia on the measurement of light. Soc. 



Ital. I. in. 

 Count Humford's photometer. Ph. tr. 1794. 



67. Rcpert. IV. 255. 

 Leslie's i hotometer. Nich. Ill, 46l, 518. 



Glib. V. 286. 

 . A thermometer. 



Measurement of Refractive Powers, 



Clairaut on the measurement of refrangibility, 



A. P. 1756.408. 

 Martin's optics. 

 Euler on the examination of refraction by 



prisms. A. Berl. 1766. 202. 

 Due de Ch;iulnes. A. P. 1767. 423. H. 162. 

 Priestley's optics, v. §. 8. c. 2. 

 Venturi on measuring dispersion. Soc. Ital. 



III. 268. 

 Rochon Recueil de m6moires sur la meca- 



nique et la physique. Mem. sur la mesure 



de la dispersion et de la refraction. 



His diasporometer is a compound prism. 



*Wollaslon's mode of examining refractive 

 and dispersive powers. Ph. tr. 1802. 365. 

 Nich, 8. IV, 89. 



Measurement of Transparency. 



Murhard on Saussure's diaphanometer, for 

 measuring the transparency of the air. Ph. 

 M. III. 377. 



Catoptric Instruments, 



Account of Vilette's concave, 30 inches in 



diameter, 3 feet focus. Ph. tr. 1665 — 6. I. 



95. 

 Vilette's second concave of metal, 34 inches 



in diameter. Ph. tr. 1669.IV. 986. 

 A speculum 3 Leipzig ells in diameter, of 



thin copper plate. Ph. tr. I686. XVI. 



352. 



Not very good. 



•j-Gray on specula nearly parabolic, Ph, tr, 



1697. XIX. 787. 



In the form of the catenaiia. 

 Lagarouste on a burning mirror. A. P. I. 



276. 

 Lahire on the multiplication of images by 



plane glasses. A. P. 1699- 75. H. 86. 

 Leupold Anamorphosis nova. 4. Leipz. 1713. 

 Harris and Desaguliers on Vilette's concave, 



47 incliesindiameter, 38 inches focus. Ph. 



tr. 1719. XXX. 976. 



They say, that it burnt less powerfully when it grew hot. 

 Perhaps for the same reason as Herschel's glasses transmitted 

 more heat when they were hot, and reflected less, 



Dufay's catoptrical experiments. A, P. 1726. 



165. H. 47. 



Obsenes how much culinary heat is intercepted by glass. 



Leutinann's anamorphosis. C. Petr. IV. 202. 



Cal. Smith's glass speculums. Ph. tr. 1739- 

 XLI. 



Newton's paper on a reflecting instrument 

 like Hadley's. Ph. tr. 1742. 155. 



Speculums. Smith's optics, iii. c. 2. 



Chateau Blanc's reflecting lamps. A. P. 1744. 

 H, 62. Mach.A.VII. 273. 



Cassiui on burning mirrors. A. P. 1747. 25. 

 H. 113. 



Courtivron's comparison of plane and spheri- 

 cal mirrors. A. P. 1747. 449. H. 117. 



Needham on Buffon's mirror, burning at the 

 distance of 66 feet Fr. Ph. tr. 1747, 493. 



