372 Society for the Encouragement of National Industry. 



tubes of brass without introducing lead. — Boucher, geo- 

 graphical engineer, for a perspective instrument, and anoth- 

 er designed for trimming crayons for the use of the panto- 

 graph. — CUnchamp, foran instrument destined to form per- 

 spectives, and furnish several proofs upon paper. — Gam- 

 hert, for his admirable astronomical instruments, and par- 

 ticularly his repeating theodolite, a master piece of work- 

 manship. — Lenoir, Collardeauahd Clouet, for their sliding 

 rules, and Hoyau for that which he imported from England 

 for determining chemical compounds.— -TAomos, for an in- 

 genious system of wheel work which gives at sight the nu- 

 merical result of all sorts of calculations, by simply drawing 

 a cord which sets the mechanism in motion. — Laujosois, 

 Dumontel, and Gros d^Anisi for their potteries, remarka- 

 ble for elegance of form, and the enamel which adorns 

 them. — Garros and Bonnet, for their artificial Bitumen, 

 destined to improve the unvvholesomeness of damp habita- 

 tions, and prevent the infiltration of water.— ^^rra^o and 

 Fresnel, for their lamps with many wicks and a double cur- 

 rent of air designed for light houses. M. De. Gerando 

 has justly praised in this report the steam engines of M. 

 Saidnier, and those of Casalis and Cordier of St. Quentin; 

 the machines of Risseler and Dickson for spinning ; the 

 subterranean grannaries of Ternaux, and the methods of 

 Count Z)c;ean for the preservation of grain; the memoir of 

 Hericart de Thvry upon steel; that of Valcouri on steam 

 engines; the collection of agricultural machines of Count 

 Lasteyrie and Le Blanc. He has announced the com- 

 mencement of a work very important to the arts in France, 

 viz, a new Dictionary of Technology published by mem- 

 bers of this Society ; sCrch a work is wanting in Europe. 

 The report terminates in noticing the experiments of Dar- 

 figues on the extraction of Potash by the incineration of 

 divers Tplants-, those o( Desprdz on the power of malals to 

 conduct heat : and the interesting operations o( Breant in 

 the fabrication of steel, who has succeeded in forming 

 blades of damascus equal to those of India : the process 

 will be rendered public in conformity to those prudential 

 measures which the interests of French commerce render 

 necessary. 



From the accounts given oHhe financial situation of the 

 society, it appears that there are now near 900 subscribers, 



