[Yoda]

The definition or descriptive text doesn't meet the definition of a tripod (a three legged support). Any attempt to use a line down to the base line (line between the feet) is not a leg but bisecting line (three is a name for this, I can't recall) which divides the base line into two equal segments. Now if this bisecting line forms two rt triangles on the base, then this is an isoscele triangle, otherwise it is just a non right triangle. There is no requirement that I know of that would make this an isosceles triangle, since you can bend the knees, spread the feet, all of which will move the apex, the pivot center and change the length of lines between the feet to the apex.

The defintion or descriptive text does define the pivot center to between the feet, in the middle.

Did Homer update or change the glossary to add some words to explain this 'tripod'?

This is confusing, Homer did what I thought was a great job on explaining and showing the 'Triangle Assembly', I would think that this would merit the same level of detail.

You're right, Martee, it would have been helpful had Homer provided more detail. Unfortunately, he left us only with the quote that was to be added to 2-H (Shoulder Motions). Also, in the 7th edition revisions, we find a note in 7-12 where he said simply, "present Pivot Swing Center Tripod." While there were a number of revisions to The Glossary, none referred to the Tripod.

Regarding the isoceles triangle, that is my own concept. Homer states in 1-L #21 that "The relation of all Machine positions and motions can be described by a geometric figure." I used the triangle to describe relationship of the centered Head to the Feet. This description is supported by Homer's Pivot Swing Center Tripod concept and the photos in 9-1 and 9-2. Certainly, the relationship is not the near-right triangle so often seen when the player hangs his head well back in the stance, sometimes even over the right foot.