Hot stuff, but a real genuine clinker.

In some locomotives a frame carrying a number of fire bars is made so that it may be dropped suddenly by loosening a catch; but it is found that any such mechanism can rarely be long kept in working order, as the molten clinker by running down between the frame and the boiler will generally glue the frame into its place.

The pavement of the stall should be nearly level, with a slight incline towards the gutter, to keep the bed dry, paved with hard Dutch brick laid on edge, or asphalte, or smithy clinkers, or rubble-stones, laid in strong cement.