It can't be as hot as that.

My constitution never could stand it." His constitution stood up under the heat in the tin mill.

So it is plain that the tin-mill temperature was somewhat less than the temperature of the Pit.
Outsiders began coming into the mills and giving us workers a chill by telling us that the heat was killing us.

The men used to cool themselves down with a glass of beer at the close of the day.

The social investigators told us that alcohol taken into the system at such a time would cause sunstroke.