Marx, Wing, and Hoskins for the 72-in. pipe of the
Pioneer Power Plant of Ogden.[C] Probably 0.011 would be a fairly safe
figure to use in designing new work.
[Illustration: FIG. 3. DETAILS OF OLD WOOD PIPE.]
J.L. CAMPBELL, M. AM. SOC. C.E. (by letter).--Referring to Mr. Smith's
question about the velocity measurements by bran, the first appearance
of the bran and the colors was taken because the intervals of time given
thereby were in close accord among themselves and with the weir
measurements. The time from the first trace of bran or color until final
disappearance varied between 15 and 20 min. Bran in abundance or
pronounced color showed in 2 min. after the first appearance, while the
disappearance or fading was noticeable after a period of from 7 to 10
min. It required 2-1/2 min. to get the bran or colors into the intake at
the head of the line and leave the water clear.
[Footnote B: _Transactions_, Am. Soc. C.E., Vol. XXXVI, p. 26.]
[Footnote C: _Journal_, New England Water Works Assoc., Vol. XXII, p.
279.]
Mr. Allen refers to the bored wood pipe laid many years ago in Eastern
cities. The writer's experience indicates that a bored pipe will not
deliver as much water as a planed stave pipe, on account of the greater
interior roughness of the former.
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