He started his career as a friend of David Gilmour (Pink Floyd guitarist) and was part of a mid-1960's band called 'Joker's Wild'. From there, Gilmour was a major part of persuading him to play on various Pink Floyd studio albums as well as during many live performances between 1972 and 1995.
The main and less forgivable error is that Parry suggests that the last "stone" pyramid of Egypt was that of Menkaure at Giza (late Fourth Dynasty), describing all the subsequent pyramids as being built in mud brick cased in limestone.
This theory, which Parry is honest enough to admit may have been proposed independently by others before him, argues that the pyramids were built using a combination of ramps and wooden rockers.
When used with ramps, Parry demonstrates that the size of the ramps can be reduced by increasing the gradient to 1 in 4, steeper than the 1 in 10 ramps required for sleds (a 1 in 10 ramp to the top of the Great Pyramid would have been around a mile long!).
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