long, clear flame. The air necessary for the combustion is sucked
through the interior of the nozzle, H, which is in front of the
tuyere. It will be seen that the current of steam can be regulated by
moving the tuyere, D, from or toward the eduction orifice. This is
effected through a maneuver of the hand wheel, F. In the second place,
the flow of the petroleum is made regular by revolving the hand wheel,
G, which gives the piston, O, a to and fro motion in the tuyere, D.

[Illustration: FIG. 1--THE DIETRICH PETROLEUM BURNER.]

The regulation may be performed with the greatest ease. It is possible
to instantly vary, together or separately, the steam and the
petroleum. Under such circumstances, choking is not to be feared at
the petroleum orifice, where, according to experiment, the thickness
of the substance to be vaporized should not be less than 0.04 of an
inch.

The petroleum might evidently be made to enter at A and the steam at
B; but one of the conclusions of the experiments cited is that the
performance is better when the jet of steam surrounds the petroleum.
It will be understood, in fact, that by this means not a particle of
the liquid can escape vaporization and, consequently, combustion.
Moreover, as the jet of petroleum is completely surrounded by steam
its flow can be increased within the widest limits, and this, in
certain cases, may prevent an obstruction without much diminishing the
useful effect of the burner.

The apparatus is easily and rapidly taken apart. It it is only
necessary to remove the nozzle, C, in order to partially clean it. It
would even seem that the cleaning might be done automatically by