portable A-frame

Claude Genest genest at together.net
Thu Aug 16 12:52:00 EDT 2001


I'd like to see that photo, mate ...



> From: "Naomi & Rick Coleman" <peds at tpg.com.au>
> Organization: P.E.D.S.
> Reply-To: "permaculture" <permaculture at franklin.oit.unc.edu>
> Date: Thu, 16 Aug 2001 21:38:05 +1000
> To: "permaculture" <permaculture at franklin.oit.unc.edu>
> Subject: Re: portable A-frame
> 
> Hi Peta,
> 
> Russ's design is a good one. Here is an adaptation that we use in third
> world countries where spirit levels (and even surfaces!!) are hard to
> find...
> 
> Once you have made the A shape (and we use nails not butterfly bolts as
> these are readily available and cheap, but not as portable) you bang a nail
> in half way at the top point of the A.
> 
> Then attach a string which has a rock or heavy object on the other end, and
> hang down (like a plumb line)
> 
> To calibrate the A frame (ie to make sure it measure a contour accurately,)
> you place the A frame on any fairly even surface and mark the spot on the
> horizontal bar of the A where the string hangs down. Then carefully turn the
> A frame to the opposite side, using exactly the same marks on the ground to
> put the A onto, and again mark the spot where the string hangs down on the
> horizontal bar.
> 
> You now have two marks, one on each side of the bar. The point exactly in
> the middle is the one to clearly label. Now when you use the A frame, you
> know that it is level when the string hangs down at this mark.
> 
> This may sound complex but actually it is so much easier than conventional
> systems because you dont have to build a precisely measured, perfectly
> straight frame, you can use old scraps of timber and be totally unskilled at
> building and still have an accurate measure.
> 
> I can email a photo of us using such a frame on the slopes of Ecuador if
> anyone is interested.
> 
> Good luck,
> 
> Naomi Coleman
> Southern Cross Permaculture Institute
> Victoria, Australia
> ----- Original Message -----
> From: "Peta Hudson" <petahud at ihug.co.nz>
> To: "permaculture" <permaculture at franklin.oit.unc.edu>
> Sent: Tuesday, 14 August 2001 20:01
> Subject: portable A-frame
> 
> 
>> Hi to everyone out there, I'm starting out on the road of teaching Pc
>> here in Dunedin (South Island of NZ) & have just joined this listserve.
>> I'm wondering if anyone can tell me how to make a lightweight, portable
>> A-frame for measuring contours? I seem to remember seeing one that
>> looked as though it even folded up. Cheers Peta
>> 
>> 
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> 
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