372 Society for the Encouragement of National Industry. 
tubes of brass without introducing lead.—Boucher, geo- 
graphical engiveer, for a perspective instrument, and anoth- 
er designed for trimming crayons for the use of. the panto- 
h.—Clinchamp, for an instrument destined to form per; 
spectives, and furnish several proofs upon paper.— Gam- 
bert, for his admirable astronomical instruments, and _par- 
ticularly his repeating theodolite, a master piece of work- 
mansbip.—Lenoir, Coliardeau and Clouet, for their sliding 
rules, and Hoyau for that which he imported from England 
for determining chemical compounds.— Thomas, for an in- 
genious system of wheel work which gives at sight the nu- 
merical result of all sorts of caleulations, by simply drawing — 
a cord which sets the mechanism in motion.—Laujosots, 
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 unwholesomeness of damp habita- 
tions, and prevent the infiltration of water.—Arrago and 
Fesxel, for their lamps with many wicks and a double cur- 
rent of air designed for light houses. M. Dr. Geranvo 
has justly praised in this report the steam engines of M. 
Sauinier, 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 Dejean for the preservation of grain; the memoir 0 
Hericart de Thury upon steel; that of Valcourt on steam 
engines; the collection of agricultural machines of Count 
Lasteyrie and Le Blane. 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 ; such a work is wanting in Europe- 
The report terminates in noticing the experiments of Dar- 
tigues on the extraction of Potash by the incineration of 
divers plants; those of Despretz on the power of metals to 
conduct beat : and the interesting operations of Bréant 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 
neasures which the interests of French commerce render 
From the accounts given of the financial situation of the 
society, it appears that there are now near 900 subscribers; 
. 
