A. Yes; the lip or bushing should be closed to proper opening so that
steam will be restricted at the nozzle and escape with a bursting effect
to properly atomize the oil instead of flowing out in quantities against
flash walls before it has time to ignite.

37. Q. What is the real object of having the fire-box lined with bricks,
and will engine steam without them?

A. Not so well as with the brick, the sheets being in contact with water
are too cool to flash the oil readily and hence the use of what is
called a "flash wall" built of fire brick and heated to a very high
temperature aids combustion very materially.

38. Q. Do you consider it your duty to keep close inspection of brick
work as to need of repairs, such as air entering between brick and side
sheets?

A. Yes. To see that plaster is kept between the walls and sheets to keep
cold air from being drawn in.

39. Q. Will engine steam if brick falls in front of burners or in path
of flame and what may be done?

A. No. Remove them with the brick hook or rod by pulling them out
through damper of draft pan.

40. Q. Where engine is equipped with an oil-reheater or oil line, do you
consider it a help to engine's steaming qualities when used?

A. Yes; at all times this heater should be used.