My neighbour has a tall chimney (for a wood burning stove) with a supporting cable, but only one. Obviously the wind doesn't always come from that direction (in fact the cable is to the SE of the chimney, and the prevailing wind here is SW). Same thing is observed on telephone poles. Any explanation? Is the pole put in at a bit of an angle so it's always leaning one way?
Ah, that makes sense. So in a straight line the pole is ok, but on a corner it's getting yanked too much one way.
I think in my neighbour's case, as the chimney comes through the roof, there isn't room to attach a wire anywhere else, I suppose he might have something else inside the roof counteracting it.
Yes back in the old days you could often see men in vans going around
tightening up these cables. I assume the wire that ran between poles also
had some kind of steel component to make sure it had the strength.
As for chimneys etc, theat is a whole other issue.
Sounds a bit like a bodge!
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On Mon, 11 Mar 2019 01:36:59 +0000, The Natural Philosopher wrote:
Though coming from the weight the tension in a phone line is much
higher to get a shallowish catenery so the line doesn't flail about
too much in the wind. It's really only poles at the end of a line or
where the line sharply changes direction that have assymetric forces.
With poles roughly equally spaced and in a row the forces balance
That isnt what happens here. Where the phone line isnt
underground, its on the power poles and the power lines
are the problem. We don't have any catenery with our
phone lines. Even the much older aerial phone lines seen
in rural areas run by themselves have no catenery at all.
If the support is split between above and below the roof then it implies
significant stiffness in the pipe itself. Which if true suggests it does
not need an external cable.
I suspect it was installed for largely cosmetic reasons rather than for
sound engineering principles.
If it does eventually fall down the cable will probably stop it crashing
to the ground and causing personal injury ;-)
It does look quite stiff, but it's a tall chimney and there could be a fair force on it from wind, which they won't want transferred to where it's attached to the stove, which could cause a leak of fumes into the house.
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