HEATING RY HOT WATER. 195: 
pass directly into the heating pipes, and with the levels 
properly adjusted, they will work well. At the same time 
it is as well to afford a slight rise from the boiler into the 
' pipes, if only 6in. or 8in., by dropping the former a 
little. 
A very excellent and 
effective form of these 
independent cylindrical 
boilers, and the best of 
the entire class where 
a more powerful article 
than those just des- 
cribed is required, is 
the dome-top boiler, 
shown in Fig. 185. 
This is constructed on 
very similar lines to 
the ‘‘ Star’ boiler, but 
ey |. 
ally 
the top, instead of ae 7) ng Rta 
_ i : i}: SCRA 1) 
being flat, with a feed ie wa yA eo 
door, etc., is made into 
Te 
a dome-shaped water- 
way, the inner surface 
of which presents a  fl#=2>===== 
large and highly effec- 
tive heating surface to Fye, 135. 
the fire. The feed-door 
is removed to the front, as shown in the sketch, the exit 
into chimney being placed at the back some little distance 
below the crown of the dome. So much more does the 
dome, etc. add to the heating power of this boiler, that 
0 2 
