For this object nearly all the known
spray injectors have very long and narrow orifices for petroleum as well
as for steam; the width of the orifices does not exceed from 1/2 mm. to 2
mm. or 0.02 in. to 0.08 in., and in many instances is capable of
adjustment. With such narrow orifices it is clear that any small solid
particles which may find their way into the spray injector along with the
petroleum will foul the nozzle and check the fire. Hence in many of the
steamboats on the Caspian Sea, although a single spray injector suffices
for one furnace, two are used, in order that when one gets fouled the
other may still work; but, of course, the fouled orifices require
incessant cleaning out.
_Locomotives._--In arranging a locomotive for burning petroleum, several
details are required to be added in order to render the application
convenient. In the first place, for getting up steam to begin with, a gas
pipe of 1 inch internal diameter is fixed along the outside of the boiler,
and at about the middle of its length it is fitted with a three-way cock
having a screw nipple and cap. The front end of the longitudinal pipe is
connected to the blower in the chimney, and the back end is attached to
the spray injector. Then by connecting to the nipple a pipe from a
shunting locomotive under steam, the spray jet is immediately started by
the borrowed steam, by which at the same time a draught is also maintained
in the chimney.
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