Description of Mr Perkins's New Steam-Engine. ITS 
were likely to meet with various kinds of opposition. Instead 
of hailing it as an invention which was to do honour to the 
age in which we live, and to add a new and powerful arm to 
British industry, imperfect experiments and confined views 
were urged against the principle of its construction, the 
jealousies of rival traders were arrayed against it, imaginary ap- 
prehensions of danger were excited, and short-sighted politi- 
cians sounded the alarm, that such an invention would precipi- 
tate our country from its lofty pre-eminence among the manu- 
facturing nations of the world. 
Most of these grounds of opposition have been now removed 
by direct experiment. Mr Perkins's engine is actually at work. 
Its operations have been witnessed, and minutely examined by 
engineers and philosophers of all kinds ; and the most unrea- 
sonable sceptics have been compelled to acknowledge the just- 
ness of its principles, as well as the energy of its operations. 
The active and inventive mind of Mr Perkins, however, did not 
remain satisfied with this experiment. He has discovered a me- 
thod, which we consider equal in value to his new engine, by 
which he can convey the benefit of his original principle to steam- 
engines of the old construction ; and this has been recently suc- 
ceeded, we are told, by a most extraordinary discovery, that the 
same heat may be made to perform its part more than once, in 
the active operations of the engine. 
In order to convey to our readers some idea of these great 
inventions, we have obtained a drawing, made by M. Mont- 
golfier jun,, and given in Plate IV. Fig. 16., which, though it 
does not represent the actual machine, yet contains such a view 
of its parts as is necessary for understanding its principle. 
The generator, which supplies the place of the boiler in ordi- 
nary steam-engines, is a cylinder ABCD, made of gun-metal, 
which is more tenacious, and less liable to oxidation, than any 
other. The metal is about three inches thick ; aiid the vessel, 
containing eight gallons of water, is closed at both ends, with 
the exception of the five openings for tubes, shewn in the 
figure. The generator is placed vertically in a cylindrical fur- 
nace EF, whose chimney is G, the heat being sustained by a 
pair of bellows H, wrought by the engine, and conveying its 
blast in the direction IK to F. A heat of from 400° to 450° of 
