Douglas Campbell

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since Jun 16, 2015
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Biography
I trained in plant biology, but worked as a microbiologist for many years.  I am interested in energy efficiency, sustainability and permaculture.
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Nova Scotia
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Recent posts by Douglas Campbell

Douglas Alpenstock wrote:

Susan Boyce wrote:Did you ever find any filter that works?


Good question.

I have a vague memory of somplace in India (I think? or maybe Pakistan? or Bangladesh?) where water wells were drilled by well-meaning NGO's -- and turned out to be dangerously high in arsenic, because of the underlying geology.


It is the Ganges delta in Bangladesh that suffers widespread arsenic from well water.

Further to Michael; each pulley on the moving load increases force.  Pulleys on stationary anchors or motive force redirect motion.
And with a cunning arrangement of pulleys, UHMW rope and large logs you can pull the rear end off a Honda CRV.
Explain that one to your partner...
1 week ago
Rubus chamaemorus is called 'bake apple' in Newfoundland.
The myth(?) is that a French colonist asked
'Baie, Qu'Appelle?'  ('Berry, called what?)

In Sweden they are sold in plastic bags of mushed berries & juice;  I heard they have natural anti-fungal properties so do not go mouldy.

I find them frustrating to pick; one big leaf, one berry per shoot, but will throw them in with blueberries or lingon if I find them.
2 weeks ago
I agree with David.
The market is changing quickly.
3 years ago we installed grid-tie solar in Nova Scotia with 1:1 kWh exchange with the utility; send a kWh on a sunny day, take a kWh in the dark.
At the end of the year any positive balance in our favour is zeroed out.
So 3 years ago our system was sized at ~85% of our consumption, to avoid 'losing' power to the utility.
But today my neighbour's new system is sized at 101% of consumption, because panels are so cheap that 'losing' a few percent to the utility is negligible.
10 of 36 houses in our little neighbourhood now have grid-tie installs, with a payback of ?8-9? years.

5 years ago in New Brunswick the deal was similar, except the utility sold us power, charging tax, but forced us to pay the 'tax' to return power to them.  15% each way made the deal less favourable.
As batteries drop in price, total offgrid becomes progressively more attractive.
3 weeks ago
Hi
Rugosa roses are salt tolerant; some strains grow to 2 m, and fruits are comparable in size to crabappples.
Not useful for apple pollenation though.
cheers Doug
1 month ago
Warming up pond water might lead to ghastly pathogen proliferations.
1 month ago
Hi - if the glass jar is on a vent tube, what is the purpose of the two black elbows beside it?
thanks Doug
1 month ago
Hi Lala
What is the glass component behind the seat?
thanks Doug
1 month ago
I built a roundwood woodshed last year of similar scope, to try out approaches.
I followed ideas from https://www.youtube.com/@KrisHarbour
on how to layout joints for curving pieces; it worked fairly well.
I cut lap joints at the tops of the main posts, with natural forks as knee braces.
On a different thread I read an expert writing that knee braces are not necessary, but they certainly stiffened my structure.
The post ends are under a metal roof so I did not attempt preservation beyond linseed oil.
I used timbers end-to-end through the concrete block holes, and recycled cabling,  to use the weight of the firewood load to anchor the structure and roof to the ground.
It has come through its first winter fine.

My next project is actually a honeysuckle arbour.
cheers Doug