|  | 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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