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LXXII. An 'Engine for raifing Water by Fire; 
being an Improvement of Savery’j Con ft ruc- 
tion^ to render it capable of working itfelf \ 
invented by Mr. De Moura of Portugal, 
F. R. S. defer ibed by Mr. J. Smeaton. 
Read Nov. 9, r f“ ^HIS engine coniifts of a receiver, a 
* Jl fteam and an injedtion-cock } a 
fudtion and a forcing-pipe, each furniftied with a 
valve j together with a boiler, which, on account of 
its bulk and weight, is not fent with the reft} but, 
as it may be of the common globular ftiape, and 
having nothing particular in its conftrudtion, a de- 
feription of it will not be neceflary, as alfo the 
reft of thefe parts already mentioned being effential 
to every machine of this kind, a further account 
of them may be difpenfed with. What is pe- 
culiar to this engine is a float within the receiver, 
compofed of a light ball of copper, which is not 
loofe therein, but faftened to the end of an arm, 
which is made to rife and fall by the float, while the 
other end of the arm is faften’d to an axis } and, con- 
fequently, as the float moves up and down, the axis 
is turned round one way, or the other. This axis is 
made conical, and pafles through a conical focket } 
which laft is folder’d to the fide of the receiver. Upon 
one of the ends of the axis, which projects beyond 
the focket, is fitted a fecond arm, which is alfo moved 
backward and forward by the axis, as the float rifes 
or falls. By thefe means, the rifing or falling of the 
furface of the water within the receiver communicates 
a correfpondent motion to the outfide, in order to 
give 
