Grand Gallery Model The Grand Gallery is aptly named because after walking bent over thru hundreds of feet of rectangular access passages, it opens into something far beyond just a comfortable place to stand upright inside. Many have marveled at its construction and several people including Piazzi Smyth and Sir Charles Petrie spent many weeks surveying and measuring the inside surfaces. It would have been very easy to stick a straight edge under the overlapping stone and get the measurement of the overlap length. On the ends north and south these measurements vary quite a bit as reported in Petrie’s entrees. Piazzi Smyth measured the widths and Petrie did not apparently repeat them beyond what he needed to verify the accuracy of the earlier measurements by Smyth. Therefore something most peculiar escaped the notice, apparently, of all who examined the resulting documents. One can see in the column E that the differences from one level to the next is always a consta