THE 
EMPORIUM 
OF 
ARTS AND SCIENCES. 
VoL. IL April, 1814o No. IIL 
STEAM ENGINE. 
f Concluded, J 
I HAVE not procured the specification of which the 
following is an extract. I copy the Monthly Magazine 
for October, 1811, voL 32, p. 255. 
Arthur Woolf '^s Patent^ for improvements in the 
construction and working of Steam Engines^ calcu^ 
\ lated to lessen the consumption of fueL 
j THE nature of this invention may be thus described : 
i The working cylinder of the steam engine has no bottom^, 
I but is enclosed in another cylinder of such dimensions^, 
I that the space between the two, which space is called the 
j receiver, is equal to at least the contents of the working 
! cylinder. The enclosing cylinder has a bottom, and the 
two cylinders are joined together at the top by fianghes, 
or any other suitable means, and the lower rim of the 
working cylinder is about as far distant from the inclos** 
ing cylinder as the distance between the sides of the two 
i cylinders. Instead of having a void space for receiving 
Vol. IL Uxj 
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