New Blowing- Machine. STS 
must be graduated, ’ and kept equal to the maximum te;upera- 
ture, — and the mass must be left in the fire from 24 to 30 
hours, and allowed to cool very slowly. — See Bulletin de la 
Societe d^Encouragementytom. xviii. p. 311, 
6. ^description a New Blowing-Machine. 
This blowing-machine, which is used in the Hartz, is repre- 
sented in Plate V. Fig. 5. It consists of a chain of floats moving 
round a wheel A. These float-boards are impelled by the 
weight of the .current of water MN ; and it is manifest, that, for 
a given velocity of the machine, the quantity of water admitted 
upon the floats may be such, that the space between two con- 
secutive floats shall not be filled with water. The rest of the 
space will therefore be filled with air, which will be conveyed 
into the reservoir and will escape at S, or may be conducted 
wherever we please. The theory of this machine has been in- 
vestigated by M. Clapeyron. The great simplicity of this blow- 
ing-machine may render it very useful, under particular circum- 
stances ; but it is obvious that the friction must be considerable.— 
See the Annales des Mines^ tom. vii. p. 3. 
7. Account of Improvements made on Steam-Fackets^ and other 
Vessels. By David Gordon, Esq. 
Mr Gordon, to whom the public is indebted for the portable 
gas-lamp, and other inventions, has taken out a patent for diffe- 
rent improvements on Steam-Packets. 
Fig. 6. of Plate V. represents an horizontal plan of the deck 
of a steam-boat or steam-packet, adapted to sea or river naviga- 
tion, constructed according to' Mr Gordon’s improvements ; and 
Fig. 7. a longitudinal section of the same. A represents the 
paddle-wheel, which may be constructed in the manner of ordi- 
nary steam-boats; but it is inclosed in a case in such a way 
that the sides or edges of the paddles have just liberty to move 
freely between the sides of the case ; the wheel is inclosed by 
the case in front (or towards the bow of the vessel), leaving 
only an aperture at a for the water to arrive at the paddles 
of the wheel ; aud this aperture should be entirely below the 
VOL. VII. NO. 14. OCT. 1822. B b 
