[Yoda]

I still have questions that have gone unanswered.

1. This 'Tripod' concept, where is it in the book (I obvously have missed it, bad Martee).

2. This 'Tripod' has been shown as a triangle on photos and diagrams. It is always or at least appears to be drawn as an isosceles triangle (2 sides of equal length, thus placing the apex in the center of the base). Is it really an isosceles triangle?

3. A 'Tripod' indicate 3 legs, where is the third leg? Bi-pod seems to be the percise and correct term or triangle.

4. How did it come about to state the center of the pivot center was to be in middle of the stance? Or was it to be between the two feet (not going to the outside, etc.)?

Homer Kelley introduced the Pivot Swing Center Tripod concept in his additions to the as-yet-unpublished 7th edition. Previous editions had only the photo sequences of 9-1 and 9-2 where a white reference marker was placed behind the head to show its centered location.

I quoted that concept a few days ago in the Forum TGM Advanced and the thread 9-1-5...Pics, my post #143. Here it is again:

"The important thing is that the true Swing Center -- for all components -- is around a Hinge Pin with one end at the top of the Stationary Head and the other in the ground precisely between the Feet, with no regard for Body Location or Position at any time."

So, the top of the Tripod is the Stationary Head and the base consists of the two Feet and the centered Hinge Pin falling precisely between them.