Add for loss by dust and waste, 1 cwt.,
with price of coke at (say) 13s. 4d. per
ton. 0 8
-----
Cost of breaking, per ton. 0 91/2

As coke, when broken, will usually fetch from 2s. to 2s. 6d. per ton
more than large, the result of using these machines is a net gain of
from 1s. 3d. to 1s. 9d. per ton of coke. It is not so much the actual
gain, however, that operates in favor of providing a supply of broken
coke, as the certainty that by so doing a market is obtained that would
not otherwise be available.

[Illustration: IMPROVED COKE BREAKER.]

It will not be overstating the case to say that this coke breaker is by
far the simplest, strongest, and most economical appliance of its kind
now manufactured. That it does its work well is proved by experience;
and the advantages of its construction are immediately apparent upon
comparison of its simple drum and single spindle with the flying hammers
or rocking jaws, or double drums with toothed gearing which characterize
some other patterns of the same class of plant. It should be remarked,
as already indicated, lest exception should be taken to the size of the
machine chosen here for illustration, that it can be made of any size
down to hand power. On the whole, however, as a few tons of broken coke
might be required at short notice even in a moderate sized works, it
would scarcely be advisable to depend upon too small a machine; since
the regular supply of the fuel thus improved may be trusted in a short
time to increase the demand.