Earl Weiss
Senior Master
It certainly would be helpful... but that book was written a couple years before the camera phone...
I didn't know if there was a photo, or text saying 'the lower leg is perpendicular' but if there is a photo, that should help with the "3 feet" measurement too. Unless the photo is too small or grainy.
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There is a photo. I will see if I can determine more about the 3 foot measurement.