The Collaborative International Dictionary of English v.0.48:

Sludger \Sludg"er\, n.
   A shovel for sludging out drains, etc.
   [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Sludger \Slud"ger\ (sl[u^]j"[~e]r), n.
   A bucket for removing mud from a bored hole; a sand pump.
   [1913 Webster]