412 Description of Mr. Perkins’ New Steam-Engine: 
as capable of improvement; and, notwithstanding all that 
has been done by Mr. Woolff, and other eminent engineers, 
the undoubted merit of their engines has scarcely yet been 
admitted by the public. Under such ae jateene Mr. 
Sand again it, imaginary enced sions of danger were 
excited, and short sighted politicians sounded the alarm, 
that such an invention would precipitate our country from 
its sent Sareea among the manufacturing nations of 
the w 
Most of these grounds of opposition have been now re- 
moved by direct experiment. Mr. Perkins’ engine is ac- 
tually at work. Its operations have been witnessed, and 
mre examined by engineers and philosophers of all 
ki the most unreasonable sceptics have been com- 
to acknowledge the justness of its principles, as well 
energy of its operations. The active and inventive 
waa of Mr. Perkins, however, did not remain satisfied with 
this experiment. He has discovered a method, which we 
convey the benefit of his — preg to steam-engines 
of the old construction; an s has been recently suc- 
ceeded, we are told, by a sit extraordinary discovery, 
that the same heat may be made to perform its part more 
than once, in the active operations of the snes 
Jn order to convey to our readers some idea of these 
it. Monteolie inventions, we have obtained a drawing, made by 
tgolfier, jun, and given in plate IV. Fig 16.* which, 
though it does not represent the actual machine, yet con- 
tains such a view of its parts as is necessary for understand- 
Be ea generator, which supplies the place of the boiler in 
ordinary steam-engines, is a cylinder ABCD, made of gun- 
metal, mich is is more tenacious, and less fs eg to eee. 
then po aa r. The metal is about three inches th 
and the vessel, containing eight gallons of water, is claus 
* See Plate V. 
