The end
of the band is then turned back over the clip and held down by a staple.
The staves are double-tongued and grooved and from 1-3/8 to 2 in. thick.
The smaller thickness is sufficient. The exterior face of the staves
should be turned concentric with the axis of the pipe and form a circle,
so that the band will have perfect contact with the wood.
The joints are formed by turning a chamber in one end of the pipe and a
tenon on the other, or both ends are turned to a true exterior circle
and driven into a wood or steel sleeve. The chamber and tenon were used
in this work.
Finally, each piece of pipe is covered with as much hot asphalt as it
will carry.
_Steel Bands_.--The specifications required bands of mild steel, of
60,000 lb. strength, with an elastic limit half as great. The winding was
spaced to limit the tension to 15,000 lb. per sq. in. If severe
water-hammer is present, the ordinary working stress should be
materially less than the latter, otherwise the spiral bands will stretch
enough to permit the water to spurt out between the staves. This was
determined to be true on 4,500 ft. of 12-in. pipe connecting the
Carrizozo Reservoir with a water column at the roundhouse there. In
pumping tests at the mills, attempts were made, at various times, to
burst the pipe, but they never succeeded.
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