Thanks for all the good diagrams Pugetsoundkiter. But I am not sure that I have understood the jackomixer. Assuming acute angles because the actual mixer is much more elongated than the diagram and ignoring the trigonometry, looking at the diagram, sheeting in will pull C down by let’s say n. This will pull B down half, n/2. The green line will also be pulled down n but z will not come down n because the distance is reduced by the movement of B which is n/2. Therefore the mixer is n-n/2 : n : n/2. Or in simple ratios 1 : 2 : 1, for Z:C:B.
I may well have missed something as I am newish to playing with mixers but is this why it suits pulling camber out of low aspect foils as long as the C row is not too far aft??
PS Similarly the Malabar looks 2 : 2 : 1, as in Z:C:B, to me as A is the non moving datum. Or am I missing something??