This device is very effective for heating water in open or closed tanks
by direct steam pressure without noise. The heater consists of an
outward and upward discharging steam nozzle, covered by a shield which
has numerous openings for the admission of water so that the discharge
jet takes the form of an inverted cone, discharging upwards.
[Illustration: Fig. 184.]
A small pipe admits air to the steam jet, and by mixing therewith
prevents a collapse of the steam bubbles, and the noise, which is such
a great objection to heating by direct steam in the old way. A valve
or cock on the small air pipe regulates the opening as may appear most
desirable.
Exhaust steam can by the same method be disposed of under water without
noise.