338 
Stvam Engine, ' 
erecting in Messrs. Meux’s^ brewery, and even to take 
pies of such parts of the plans as were necessary for our 
present purpose, we persuade ourselves a short descrip- 
tion of an apparatus so curious, and at the same time so 
useful, will prove highly acceptable to our readers. 
In fig. 3, A is the raain cylinder crossing the smaller cy- 
iinders «, a, a, half wa}^ between their middles and ends, 
but not joined to them at tjte points at which it crosses 
them. It is put in this place that it may come over that 
part of the furnace S, S, S, through which the flame first 
passes, and receive its direct action, which it does over 
nearly a half of its surface, as may be seen by looking at 
the vertical section ASS, fig. 6. The smaller cylinders 
have a communication with the main cylinder in the fol- 
io wing manner : —Three cylinders, CCC, are placed pa- 
rallel to the main cylinder A, over the part of the furnace 
by which the flame returns, in such a manner that each 
of the cylinders CCC takes in three of the smaller cylin- 
ders a a a, being united to and connected with them as 
shown in fig. 4, which is a longitudinal vertical section of 
that part of the apparatus. The cylinders CCC have a 
direct communication with the main cylinder A by the 
pi}>es or tubes F P P, as may be better seen by the cross 
vertical section, fig. 6, in which the same parts are mark- 
ed with the same letters as in figures 3 and 4. The three 
tubes CCC are preferred to one long tube, to prevent any 
derangement taking place in the furnace or in the tubes, 
by the expansion and contraction, occasioned by changes 
of temperature, which is more considerable in one tube 
of the whole length of the furnace, than when divided in- 
to three portions ; and it is for the same reason that the 
tube A is not made to communicate directly with the smab 
ier tubes a a a, but mediately by means of the tubes mark- 
ed C and P. — “N. B. The two outermost of the tubes 
marked P, instead of going parallel to the middle tube F, 
^ The Meux’s, are the greatest Porter Brewers in England. 
