his father was in charge of the coke ovens at the Crosby and Gilcrux Collieries, near Maryport, and who occasionally assisted his father on a Saturday, though not engaged by the manager, was passing along a gangway leading from the coal hopper to the coke ovens, when he was caught by a loaded bogie, and jammed against a brick pillar; he had been told by his father to go home, and not to pass over the gangway on his way