e)
Select pebbles E, F & G and fit onto the ribs of the fuel-bed base.
See fig. 28 below.
Fig. 28
f)
Select pebbles H, I, J & K and arrange along the rear of the
fuelbed, directly behind the third row of coals. See fig. 29 below.
Fig. 29
F
E
I
H
28
G
J
K