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XXVII. A 4, Defeription of a Fire-Tiygine of anew iiai 
Sb he Set _ Extratied from. a. Letter to the Peet io 
d 5 Portfmouth, i January 28, 1782. i. ; 
SI R 
“PAVING conftructed a model ofa portable fire-engine, 
AR on the fime principles as the pump-engine, I do miyfelf 
the honour to forw ah i adefcription of it. " ^ 
“Plate VI. Fig. t. " ABand CD are the edges of two planks, 
confined together by ai bolts. 24c4aretwo cylindrical Bar- 
rels : in each of thefe barrels a pifton with a valve is faftened to 
the fpear e, and is moved up and down alternately by the mo- 
tion of the arms E E. Under each barrel a hole is made through 
the plank A B, and covered with a valve. E E are arms hung 
on the common centre f£ Arms parallel to thefe are on the op- 
pofite fide. g'is the end of a handle which is faftened acrofs 
fheends of the arms. A boltat 4 goes acrofs from arm to arm ; 
to this bolt the piece 7 Z is faftened, and plays upon it; the 
lower end of this piece is: fattened to the top of the fpear e. 
Gf Ba ftandard tó fupport the arms ; another anfwering to 
it on the- oppofite fide, both being adios into the edges of the 
planks, are fafficiently fecured by one bolt going through them 
at /, ond having a nut or forelock on the oppofite fide. HI HI 
are fquare braces, which anfwer the purpofe of ducts, through 
which the water afcends from the barrels through the plank at 
m. KL KLare irons in the form of a ftaple to confine the 
braces; the lower ends of thefe irons meet, and are fecured 
with one bolt going through-them and MN zo, which isa 
piece going up through a mortice in the centre of the planks ; 
this piece is fquare from the lower end upward as high as the 
top of the braces ; from thence to the top it is cylindrical ; the 
S{{2 upper 
