Hi Don,

What I was trying to derive is a formula they might have applied to determine the thickness required for each course of block using Petrie's mean dimensions(NE+SW/2). There seems to be no related formula or orderly progression to maintain the 14/11 seked for each course,because of the variations of thickness in each course, This really leaves me wondering how did they do it,cut one block at a time for each position?

Regards,
Jacob