Add drawing and more words to bivirigging guide.

handbook/bivirig.html

@@ -38,6 +38,8 @@ up, because that works for all three sections. So the
 gear/stove/animal-hole wall. The 'back' is the top end of the bridge.
 The 'front' is the main entrance.</p>
 
+<img src="bivirig.svg" alt="Drawing of tarp layout">
+
 <h2>Water tarp</h2>
 
 <p>Use a long/thin (2x5m) waterproof 'logpile' tarp. It is hung
@@ -49,11 +51,12 @@ onto the 'water platform' (not into the food boxes).</p>
 <p>It's easiest to approximately tie the tarp to the side ropes with
 adjustable knots, then put the ropes in place, adjusting as you
 go. The outer line ends up too high to adjust once properly in
-place.</p>
+place. Adjust it to catch as much of the water falling through the
+hole as possible, and slope gently, but consistently downwards.</p>
 
 <p>In past years we have hung the funnel in the hole. This is a faff
 and misses a lot of water. Just hang it below the end of the tarp where
-it will get nearly all the water and is much easier to hang.</p>
+it will get nearly all the water and is much easier to hang/adjust/unclog.</p>
 
 <h2>Main roof tarp</h2>
 
@@ -71,10 +74,17 @@ that it goes all the way to the right wall, partly 'underneath', and
 the left hand edge is about in line with the steps up the middle. The back
 edge lines up with where the roof rises at the back entrance.</p>
 
-<p>Start by rigging 
-
 <p>So start by opening it out to full width on the wide central
-bed-shelf. and pulling the RH edge </p>
+bed-shelf. and pulling the RH edge close to the wall. Sequencing the ropes is a bit tricky, you need the tarp vaguely in place, then install the two main ropes to lift it up. Finalise th tarp position and tension it. </p>
+
+<p>Once the tarp is somewhat spread out, rigging the ends of the two
+main ropes - one across the front and one across the middle (passing
+under the tarp). These are the two that take high loads. The rear
+major rope has no real load - it just keeps things neat. Now tension
+them to lift the tarp up and ensure it is neatly spread. The middle
+rope attaches to the roof bolt just at the LH edge of the tarp. This
+needs someone very tall, or sitting on shoulders, or something devious
+with bivi string to pull it tight.</p>
 
 <p></p>
 

handbook/bivirig.svg

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