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Gentleman's Magazine 1853 part 1 p.127
is nearly of the same size as the former, but its masonry is
evidently that of the earliest period. The woodcut
represents it as it appears to one standing on its southern
edge. Three of its sides consist of strong masonry, the
fourth has been formed by three flags of large dimensions,
backed up with clay; two of the flags remain in their
position; but the third (the middle one) has been laid
prostrate by the pressure from behind. A flight of steps
leads to the bottom of the vault, and the entrance is closed
by a stone slab moving in a groove upon two pairs of small
iron wheels. A slit in the neighbouring wall allows of this
door being pushed back into it. In many modern railway
stations we see doors of similar construction.
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