Description of Mr. Perkins’ New Steam Engine. 117 
ter, and supplied with water from a forcing pump, as in his 
W i his generator is exposed to t in an 
analogous manner, so that, by means of a loaded valve, 
which opens and shuts. the red hot fluid may be constrain- 
ed till forced out of the generator into the water in the 
boilers of Bolton and Watt. By this means, as much low 
pressure steam of four pounds on the square inch may be 
generated by one bushel of coals, as could be produced it 
the old engine by nine bushels. This most important result 
was obtained by actual experiment. 
Since these great improvements have been effected, Mr. 
Perkins has made a discovery that seems, in its practical 
importance, to surpass them all. He now entirely dispens- 
es with the use of the condenser, and works the engine 
against the atmosphere alone ; and by methods with which 
we are not acquainted, and which indeed it would not be 
prudent for bim to disclose at present, he is enabled to ar- 
rest the heat after it has performed its mechanical functions, 
and aciually pump it back to the generator, to unite with a 
sh portion of water, and renew its useful labors. In an 
operation like this, a considerable portion of the heat must 
still be lost, but the wonder is that any should be saved ; 
and we venture to say, that the most sanguine speculator 
nthe omnipotence of the steam-engine, never dared even 
to imagine the possibility of such an invention. = 
We are well aware that, in announcing this discovery, 
We are exposing ourselves to the criticisms of those whose 
belief is naturally limited by their own experience; but it 
is satisfactory to know, that Captain Basil Hall, (whose ac- 
count of Mr. Perkins’ discoveries and inventions, as deliv- 
ered before the Royal Society of Edinburgh, gave such 
universal satisfaction,) has been entrusted with Mr. Per- 
kins? discovery, and that speaks confidently of t& 
soundness of its principles, as well as the practicability of 
ils application.* tee 
We cannot quit this ject, without congratul: ting ‘the 
“ountry on the brilliant prospects with whick thee invea- 
* After the 10th June, Mr. Perkins, whose address is Perkins & Co. 
3}, Water Lane sirlect Street: is ready to take orders for his new engines, 
a : 
his 
nary engines. The 
of Bolton & 
years which we have not heard stated. 
