HOT-WATER Al'PARATUaT 
681 
^(iiriJon ,3ijjji,;i lyvraituivf ,. ^ggoq oJ Jfidj ; guifijjjc.nl jo 
boB ^-iJajjbnr rfjrw bsJiiiuARTICLE III, g^fj j^jifj ^tBg89o«)n ai sTora 
rfaidw 'io JaoraaisJjB arfj t tnioq nodi boE ^uohfioilaqfi 
»j(AtevAi^i:^PP^fSffw<¥ ERECTING A RaH-WAmB^^^'ftg^j^f 
noq« esiuio^<§timmW ^ VINERY.-By J. Wali,ro|,. ^-^^^^^ 
gaibn'Krxs ne lo esgalivh- ^-rgg srf^ 
3%[Bo9|)pifr£t^^i3b#iSfP'V/9"t to lay before yom- readers is so.^sij^|»lp 
that when the pipes are obtained, any person may without difficulty 
fix them. The boiler (a) is thrt^,,|e^Jt, l^j^ two feet six inches wide, 
and two feet six inches deep ^j,j.j„ jg „jj|^|g 112 
down the sides. The fire i^fjjw bsJoaimoa J39(,dxj8 smoe 7o 
made in the middle (b) and, ^^-^^i^ |,niia af j ^[^-^ g^ 
leaves but six inches depth of^sjj ^avroaai brts .p^mmahy 
water over it; the water coming,, p^ ^^ ^ 
down each side of the body ofaf [[outti 
fire, and the flames also spread-risfj ad 
ing around the outside (c c) ,iij 3^ yj, 
soon causes the water to boil ;r^ 
the fire-place one foot six in- 
ches wide, and three feet long ; 
and from the great body of fire 
it will contain, the boiler is ca- 
pable of answering the purposes 
of several houses ; and the fire when once got into full action consumes 
u comparatively httle fuel. On the top of the boiler is fixed a box 
-i{d) from which issues as many pipes as there are houses to be heated, 
jEallowing one pipe to each house. Each of these pipes has a stop- 
''cock at its base (e) to turn the water, and heat on or take it oflJ'ajiy 
house required. A similar box is fixed at (f) for the return pipes, 
and on the top of it is fixed a feeding pipe (g) to allow the air to 
escape from the circulating pipes, and also to supply the boiler with 
giiwater ; the size of the feeding pipe must be regulated by the quantity 
Jgjqf water the boiler and pipes hold ; every twenty gallons, when hot, 
Jixbecomes twenty -one by expansion, for every twenty gallons therefore, 
-githe boiler and pipes hold, one gallon must be allowed for the feeder : 
-iiffor instance if the boiler and pipes hold 160 gallons, the feeding pipe 
ii ^ust hold eight to allow for expansion. Thei'e are two small pipes 
3d (fig. 113, h h) of half an inch bore placed upon the top pipes at the 
turning, to carry ofl' the air, that the water may circulate, freely. 
'^ These are carried up from four to six feet high, and if placed against 
the wall, will not be much seen ; if the pipes have to pass, a door- way, 
they may be sunk under the walk and raised again after the manner 
