Hi MJ,

You wrote:
>
> It now occurs to me that the floor area of the end
> of the DP and the start of the SP has been cleared
> of debris several times over the centuries.
> This suggests to me that the wear M&R mention
> is the direct result of these clearances.
> In which case we should not expect to see the same
> degree of wear at the other end of the Passage.
> This has me thinking that we should raise Petrie's
> 0 level for the Sub Passage floor to the level of
> the floor at the south end of the Passage.
> Such a move means that the intended and/or
> original height of the Passage is 35.5" to 36.5"
> and not 38.3" (the measure at the start of the
> Sub Passage.

As to the wear in the floor of the north end of the Horizontal Passage, my guess is that it was caused by the removal of material during the excavations in the Subterranean Chamber. For whatever reason, a protective layer may not have been in place at this location during some of this process, and as the sledge - or whatever container it might have been - was being dragged upward at the bend in order to navigate onto the Ascending Passage, extra friction would have been caused at this northern end of the Horizontal Passage. Just a guess.

As for the the interior height of the Horizontal Passage, I don't find where Petrie says from what point in the Passage he took his measurement. I do note, however, that Piazzi Smyth lists it as having a height of 36 inches (Our Inheritance - p. 221).

Best,

Lee