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WATER ROOM. 87

recommends not less than ten, in consideration of the feeding
apparatus for water not acting with perfect uniformity, even
if ever so delicately adjusted ; but in fact, contrary to what
Tredgold appears to suppose, it is usually found, that the
feed-water enters the boiler with the greatest uniformity,
when the feeding apparatus is not so very delicately adjusted,
—for the float is then not so much affected with the occa-
sional ebullition of the water. Mr« Tredgold, however,
advises us to calculate upon the feeding apparatus being
occasionally out of order, and therefore to err on the safe
side ; but as there are more causes for putting it out of order
than he seems to be aware of, we shall not be far wrong if
we take the capacity for water at a higher rate than his
estimate.
