MANUFACTURE OF COAL fl 
This is fitted with tubes surrounded by \ 
goes through the tubes and the water absorbs i 
Scrubber 
This consists of a cylindrical tower conta 
trays having slats running crosswise in checke 
a water spray at the top of the tower keeps th 
impurities down over the wet surfaces. 
gr 
is 
ch 
in 
bu 
Purifier 
This is a large box containing two trays > 
sulphur impurities in the gas are absorbed by ' 
the gas. The top or lid of the purifier can b 
dotted lines above, for changing the oxide. A 
airing is shown on the floor underneath the pu 
a 
Wc 
to 
ou 
th< 
On 
tal 
Gas Holder 
This is merely an open top circular tank fi 
smaller open bottom tank is placed so that th< 
tween the water and the top of the smaller i 
When the gas volume is increased, the lift rise 
the lift descends. The weight of the lift produ< 
th] 
stc 
Stc 
5MUTED INTO GAS 
39277 — 23. ( Face title page. ) 
c. 
