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Full text of "The Flow Of Gases In Furnaces"

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as possible, by reducing their velocity. This effect is obtained
under the crest of an inverted weir for gases, in the same manner
in which it would be done on a weir carrying water, by providing

FIG. 34.

a cistern or cutting a deeper reservoir in the weir, making an
upstream and a downstream crest.

FIG. 35.

When a weir having a thick crest (Fig. 34) is transformed into
a weir with a cistern or reservoir (Fig. 35), the velocity of flow of



v\S                             ^...-^               _..-.^-             ^*^_

n   n   n

FIG. 36.
the water in the reservoir is reduced, while the level of its free
surface remains the same.
In securing this result with an inverted weir for gases, all of the