[canals-list] Haverholme lock

[Steve]

We spent Sunday exploring some of the Sleaford Navigation. I was 
puzzled by the pump positioned to the side of Haverholme lock and the 
chamber below the pump. In the lockwall are three iron rods sticking 
into the lock chamber, maybe something to do with the pump.
 If anyone can satisfy my curiosity and tell me what the pump and 
chamber was for it would be much appreciated.
 Photos of the pump and chamber are uploaded to the Haverholme lock 
folder.