principle in six "lifts," of 30 feet deep each. The sides of each lift, or ring, except the topmost, have a section shaped somewhat like the letter N. Two of the members form a deep, narrow cup to hold water, in which the "dip" member of the ring above it rises and falls.
AUTOMATIC STOKING.
The labour of feeding the retorts with coal and removing the coke is exceedingly severe. In the