Marwood waited a moment, then added:
"In some foreign countries a tunnel kiln is used instead of an oven
like this. It is supposed to require less fuel. It is a long tunnel
with a track through the centre over which little cars laden with ware
are propelled by machinery. The heat is graded in such a way that it
is most intense in the middle of the kiln. The ware starts at one end
of this tunnel where the temperature is quite low, travels toward the
centre where the heat is highest, and then comes out at the other end
of the tunnel through a diminishing heat. In this way it cools
gradually. They say, however, that such a method is more successful
for biscuit (the unglazed china) than for the glost. Here in America
where fuel has always been plenty we have stuck to our old-fashioned
brick ovens in spite of their expense. I am afraid we are not a saving
nation."
"Father says that after this war is over we shall have to be more
saving," said Theo.
"I believe that too," confessed Mr. Marwood. "We never have learned
to figure things down to the lowest cent. We shall have to do it; and
it won't hurt us, either. On the contrary, it will be a good
lesson.
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