LAKE COLERIDGE SCHEME.
Mr A. Goodwin, of Pigeon Bay, kindly for , wards us tbe following account cf the Lake Coleridge Electric Light Works: —'-At your request, I will endeavoor to clearly explain what Messre Bruce, Piper, Leete, and myself Baw at the Lake Coleridge Ekctrio Power Sobeme in euoh a way that your readers might think they had been there and seen for them-elvee.
Aβ Btated in your last issue we arrived at the power bouse end at 920 a.m. Standing on tho road you are at once struck with the huge double-pipe line passing just in front ol you to the Urge ferroconcrete building on the left. Th's building is just on finished out-> wardly, and is well on in the inside, too. The pipes referred to are 4ft iin in diameter, and before entering the building eaoh divides into two, ju3& like a Shanghai prong. Turning your back to the power bouse, you look straight up the pipes, until they disappear over a curve near the top. The pipes are laid very trae to line on curved concrete blocks, well above the ground. They vary in thickness according to their position in the line, be'iDg gin. at the top end, Am. in the middle, and gin, at the bottom. Walking up the line to the above curve it continues a short distance on an easy grade to a high concrete wall. At (he bottom of this wall four lengths of the pipes, a few feet apart, have been built in with it. Two of these are to connect up the two lines being laid, and the other two being for more power in the future. Bending your head, and walk irjg in through these pipes, you find yourself inside a round concrete enclosure without a top, about 26 feet high, which is a little above
I e!(ike level.'Waters-tr<iinersareuß?il inhete
. prevent any obstni tion goin* down the Pits, m d lute* dnors operated from above can be 1.1 d-j*n to prevent ;be wa'er enter ing. Ti.rrvng 3cur becks to the inner end of !he : e fuv pipe?, you a c then facing the tunnel en the some level as you ttand, Four men c uld wilk s <L by t-ide in it, an' ihe top of U'e nrch id abut 8 fnet. It is concrete throi ghout, and n ; ce!y p'asteted or faced. Thfi enclosure I speak of is known as the surge chamber.
You will understand ihat the water will >isu up in this chamber unlit it finds its own level vviih that of the lake. Should the water by any means r"Be higher, provision has h(en ma'e for any overfliw (o >un in a safe direction. Walking through the tunnel tbere is little of importance to be seen, as it is just tunnel like,-and very much the same all the vay. Passing along we paged-two power drills being worked by compressed air, and the drills receiving something like a thousand blows per minute. The same power is used for rivetting the pipes together. On reaching the lake end the tunnel iinisb.es up very much the same as the other end. There is a la.rge chamber here to first receive the water from the lake After being strained, it passes through doors and enters the tunnel. I would like your readers to understand that about twenty fee , of rock between the above chatnbßr and the lake shore is untouched. When everything is ready this twenty feet will be bl uvn away to the level of the tunnel bottom, twenty feet.. In making the tunnel a low part wa ; chosen, acd a shaft put down to the proper level, and the woik went on towards each end, and we were told when thty met they wese not more than three inches out Whil our trip was much appreciated and erjoyal k> ar>d interesting, I would advise intending visitore to wait UDtil the scheme is working Thoy will ccc far more than they can now, bar a walk thro , gh the tunnel. Much more could te written, but, as it is Hearing mid night and the rising hours are early, I wi'l conclude. Hoping the above will bj easily understood,"
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LAKE COLERIDGE SCHEME., Akaroa Mail and Banks Peninsula Advertiser, Volume LXXII, Issue 4368, 30 January 1914
LAKE COLERIDGE SCHEME. Akaroa Mail and Banks Peninsula Advertiser, Volume LXXII, Issue 4368, 30 January 1914
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