Let us, for the sake of discussion, assume the markings are fake. This implies that Vyse (or his assistants, Raven and/or Hill) found a 'master' Khufu cartocuhe from some other unknown source and copied that original source.
Now, what if that original source had been presented to them horizontally--this means they would have copied it horizontally, yes?
What if this copy was then used as the 'template' for Vyse or Hill to copy into the chamber but they decide to rotate the drawing and copy it vertically onto the gabled roof trussing of Campbell's Chamber. This would mean they are copying what was effictively a horizontal drawing vertically onto the roof trussing. Might this scenario explain what you are seeing with these glyphs?
Post Edited (16-Jul-14 10:02)