CATALOGUE. — OPTICAL INSTRUMENTS. 



a 83 



Kicolini on Buffon's mirror. Ph. tr. 1747. 



Composed of 108 plane mirrors each 6 inches square ; 

 burning wood at the distance of 1 50 feet ; melting a silver 

 plate at 10 feet. 



BufFon's account of his burning speculum. 

 Ph. tr. 1748. 504. 



It was 6 feet broad and of the same height ; burnt wood 

 at the distance of aoo feet, melted tin and lead at 120, silver 

 at so'. 



Parsons on the burning instrument of Archi- 

 medes. Ph. tr. 1754. 621. 

 Lievreville's reflecting lamps. A. P. 1759- 



H. 234. 

 Zeiheron burning mirrors. N.C. Petr. VII. 



237. 

 On mirrors. Abat Amusemens philosophiques. 



1763. Montucia and Lalande. HI. 554. 

 Reflecting lamps. Art du Vitrier. f. Paris, ii. 



224. 

 Wolfe de speculis Dni. Hoesen. Ph. tr. 



1769. 4. 



They are made of brass plates, fined on wood of a para- 

 bolic form ; one 9 Dresden feet 7 inches in diameter, 4 feet 

 in focus ; the diameter of the focus being not more than 

 half an inch. Melted in Hoffman's experiments a large 

 nail in 3', a pistole in 2'. Hoffman used the two opposite 

 each other, as Dufay had done before and Pictet has done 

 since. They reflected very powerfully the heat of a strongly 

 heated stove. 2 Sept. 1768. 



Lambert on portelumieres. A. Berl. 1770. 51. 



Cones of tin for directing light. 



On speculum metal. Roz. Introd. I. 433. 

 Alut on looking glasses. Roz. III. 328. 

 Kaestner on the multiplication of images in 



looking glasses. Dissert, ii. 8. 

 Kaestner on the magnitude of images in a 



spherical mirror. N. C. Gott, 1777. VIII. 



06. 

 Mudge on the composition and formation of 



speculums. Ph. tr. 1777- 296. 

 CastiUon on conductors of light. A. Berl. 



1777. 42. 

 E. M. A. V. Art. Metal blanc. Miroitier. 



Miroirs de metal. VI. 742. Reflecting 



lamps. 

 E. M. Physique. Art. Ardent. 

 Edwards on metal for speculums. Nautical 



almanac. 1787. Nich. HI. 490. Gilb. Xll. 



167. 

 Sickingen on platina. 



Recommends 6 parts platina, 3 iron, and 1 gold. Lich- 



tcnb. in Erxleb. 



Rochon on platina. Gilb. IV. 282. 

 Klaproth on an ancient mirror. A. Berl. 

 1797. 14. 



Copper 62, tin 32, lead 6. 



On Descharmes's art of soldering glass. 



Journ. Phys. XLIX. 305. Gilb. V. 232. 

 Bernard on the manufactory of looking glasses. 



Journ. Polyt. II. 71. Repert. X. 351. 

 Beiard's photophorus. Melanges. 1. 

 Benzetiberg on speculums. Gilb. XII. 496. 

 Herschel on the action of mirrors. Ph. tr. 



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

 See Radiant Heat. 



Lenses. 



Son's parabolic glasses. Ph. tr. 1665 — 6. I. 



119. 

 Smethwick's lenses not spherical. Ph. tr. 



1668. 111.631. 



On grinding glasses on a plane. Ph. tr. 1668. 



. HI. 837. 



Wren's mode of grinding hyperbolic glasses. 



Ph. tr. 1669. IV. 1059. 



Two cylinders revolving in contact across each otherj be- 

 come hyperbolic cylindroids, and form the glass revolving 

 below them into a hyperbolic conoid. 



Cheruhin Dioptrique oculaire. f. Paris, 1 67 1 . 



Ace. Ph. tr. 1671. VI. 3045. 

 Butterfield on making glass globules. Ph. tr. 



1677. XII. 1026. 



Of pounded glass held on a pin, in the flame of a spirit 

 lamp with a wick of wire. 



Borelli on finding the focns of an object glass. 

 A. P. X. 457. 



