In addition, B and
C are connected by three 3/4-inch cross tubes, E, which prevent the small
drums spreading, and further equalize the water supply. A 1-1/2-inch drum,
D, is placed on the top of A to collect the steam at a good distance from
the water.
Materials.--In addition to 1-1/2 feet of 5 by 3/32 inch solid-drawn
tubing for the main, and 3 feet of 2-1/2 by 1/16 inch tubing for the lower
drums, the boiler proper requires 22-1/2 feet of 1/2-inch tubing, 19
inches of 3/4-inch tubing, 2-1/4 feet of 1-inch tubing, 1 foot of
1-1/2-inch tubing, and ends of suitable size for the four drums.
[Illustration: FIG. 87.--Longitudinal section of multitubular boiler.]
CONSTRUCTION.
[Illustration: FIG. 88.-Two arrangements for tube holes in multi tubular
boiler.]
The centres for the water-tubes, G and H, should be laid out, in accordance
with Fig. 88, on the tops of B and C and the lower part of A, along lines
scribed in the manner explained on p. 207. Tubes H must be bent to a
template to get them all of the same shape and length, and all the tubes be
prepared before any are put in place.
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