Hi Don,
Re Jack's observations about exact 18" separations on scoring marks this rang a bell inside me. A few years back when I was doing recording work in the Bishop's Camera roof at Farnham Castle I noted that the 6" wide x 5" deep rafters were set exactly on 18" centres. Regards
Ken Hume
Ken, this is an aside, but in the video, Jack stated the juggles were
16" not 18" apart... "16 inches on-center" was his comment.
