406 ANNUAL OF SCIENTIFIC DISCOVERY. 



Bar-iron, experiments on the quality of. Poly. Jour., 658. 



Beet-sugar. Kuhlmann. C. R., March 25. Mon. In., No. 1434. 



Bobbin "turn ing mnchine. Prac. Mech., March. 



Bread machine. Prac. Mech.. Feb , March. 



Breakwaters, principles of their construction. Civ. Eng. and Arch., April. 



Calico-printing. Wallis. Jour, of Arts. April. 



Cements and stuccoes. Knowles. Civ. Eng. and Arch . July. 



Chimneys, steam engine. Fairbairn. Jour of F. I., Dec , 1.-49. 



Cloth, machine for folding and measuring Bui. de la Soc. d'En., Jan. 



Condensing steam-engines. Smith. Civ. Eng. and Arch., Sept. 



Curvature of imperfectly elastic beams. Cox. Brewsier, Aug. 



Drain-pipes, discharge of water through. Hale. Civ. Eng. and Arch., Jan. 



Engine, pulley. Sci. Am., Sept. 21. 



Explosion of the locomotive Boston. Eacmeister. Jour of F. I., April. 



Explosion of the steamboat Louisiana. Jones. Jour, of F. I., Jan. 



Formula for the strain upon limber. Haupt. Jour, of F. I., June. 



Furnace-lift. Prac. Mech., March. 



Furnaces, iron, internal form of. Fairbairn. Jour, of F. I , Dec. 



Gypsum, preparation and application of. Burnell. Civ. Eng. and Arch., June. 



Harbour screw- cramps. Stevenson. Jameson, Jan. 



Instrument for riveting boiler plates. Bui. de la Soc. d'En.. Jan. 



Instruments, new surgical. C R., May 20. 



Iron, manufacture of, in South Wales. Damsel. Jour, of F. I., May. 



Lead, white, manufacture of. Combes. Jour, of Arts, April. 



Levelling instruments, new. Schneiiler. Poly. Jour., 655. 



Levelling stave, method of sraduat'mg. Jour, of F. I., Feb. 



Locomotives, American. Prac. Mech., Jan. Jour, of F. I., March, April. 



Locks and keys, construction of. Chubb. Civ. Eng. and Arch., May. 



Metals, calcination and fusion of. Min. Jour., Sept. 7. 



Mortar, solidification of. Villeneuve. Chem., Oct. Jour, of Arts, Sept. 



Mould-making machine for producing printed surfaces. Prac. Mech., Dec. 



Paddle-wheels for steamers. Rennie. Jour, of F. I., Jan 



Paddle-wheels, merits of the radial and perpendicular, for sea-going vessels. Isher- 

 wood. Jour, of F. I., Aug. 



Pile-drivin? pneumatic. Sci. Am., Feb. 9. 



Propellers.'screw. C. R., May 13. 



Railway and wagon springs. Adams. Mech. Mag.. March. 



Railway-axles, deterioration of. McConnell. Civ. Eng. and Arch., April. 



Roofs, open timber. Morris. Civ. Eng. and Arch , Aug. 



Ship-building, wood and iron for. Tregelles. Mech. Mag., July. 



Spindle and flyer, Whitesmith's. Prac. Mech.. March. 



Steam-apparatus, thickness and curvature of. Lame. C. R., Feb. 18. 



Steam-boiler, explosion of, in New York. Jour, of F. I.. March. 



Steam-boilers, explosions of. Civ. Eng. and Arch , May. 



Steam-boilers, mode of regulating the introduction of water into the condensers of. 

 Mon. In., No. 1437. 



Steam-generator. Boutigny. Mech. Mag , Jan. 



Steam-plough. Mech. Mag., Jan. 



Strength of materials. Buchanan. Civ. Eng. and Arch , Dec., 1849. 



Sugar, manufacture of. Brande. Lit. Gaz , Feb. 



Terra-cotta and artificial stone. Civ. Eng. and Arch., July 



Thermo-hydrorneter or oil test. Prac. Mech., May. 



Transfer of mail-bags on railroads, machine for. Mech Mag., March. 



Ventilation of mines. Ath., July. Min. Jour., June 8, 15. 



Victoria regia house at Chalsworth. Civ. Eng. and Arch., Oct. 



Warming and ventilating Blockly Almshouse. Jour, of F. I . April. 



Water, motion of, in pipes. Voisins. Civ. Eng. and Arch., April, May. Jour, of F. I., 

 July, Aug., Dec. 



Water, purifying and filtering of. Henderson. Civ. Eng. and Arch., Aug. 



Wave-principle applied to vessels. Russell. Jour, of F. I., Feb. 



NATURAL PHILOSOPHY. 



Aerometric balance. Potter. Brewster. Aug. 



Aneroid barometer. Lovering. Sill., March. 



Atmosphere, neutral points in. Brewster, C. R., May 6. 



Brushes, Haidinger's. Stokes. Ath., Aug. 10. 



Colors, inability to distinguish. D'Hombres-Firmas. C. R., Jan. 7. 



Colors, complementary, experiments on. Maumene. C. R , Feb. 25. 



