Tacoma: Electric City of the Pacific Coast, 1904Pratt, Louis W.
History
Tacoma: Electric City of the Pacific Coast, 1904
Pratt, Louis W.
Tacoma (Wash.) -- Description and travel
A page of illustrations is here presented showing, from recent
photographs, some of the principal features of the power plant at
Electron. The water for the plant is taken from the south fork of the
Puyallup River, below its junction with the Mowich, thirty-five miles
from TACOMA and 1,800 feet above sea level. The river at this point
drains five of the largest glaciers of Mount Tacoma. A low dam has been
constructed, shown in the photograph of the headworks, whence the water
is conducted by a flume eight feet wide and eight feet deep, following
the contour of the river canyon and descending at the rate of seven feet
to the mile, ten miles and a half to a reservoir covering twenty-one
acres and averaging twenty feet in depth, on the crest of the hill above
the power house. The reservoir holds in reserve ten hours’ supply for
the power plant. The water is dropped from the reservoir to the power
house through four steel pipes or penstock lines, 1,700 feet in length,
erected on the slope of the canyon at an angle of about 45 degrees. A
fall of 887 feet and a pressure of 400 pounds to the square inch is
thus secured. Four million pounds of steel pipe were required for the
penstock line, each cylinder being four feet in diameter at the top and
reducing to two seven-inch nozzles for each pipe. The water issues from
the nozzles at a speed of about three miles a minute and is applied to
four impulse water-wheels specially constructed for the purpose. The
present electrical installation includes four generators, each of 3,500
kilowatts capacity. The flume, the reservoir, the forebay, the slope for
the penstock line and the site for the power house have been constructed
or prepared with a view of adding to the capacity of the plant. The
west wall of the power house shown in the illustration is temporary, in
contemplation of its extension and the installation of from two to four
additional 5,000-horse power units as soon as required.
The present plant is abundantly supplied with water by the flume filled
to a depth of three feet. The water passes through the flume at the rate
of seven miles an hour. There is abundance of water for the operation of
the plant in the Puyallup River at all seasons of the year, as the river
is fed by torrents from the glaciers in the dry season and by copious
rains in the winter.
[Illustration: Views in Tacoma’s Parks.
1—Superintendent Roberts’ Lodge at Point Defiance Park.
2—The Sound from Point Defiance Park.
3—Glimpse In Wright Park.
4—The Beach at Point Defiance.
5—Spanaway Park.
]
Public-domain text, read in full here on John Shaqi.
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