he gasolene tank _A_ is used to hold the fuel, which is fed to
the gasolene burner _C_. The gasolene burner operates on the principle
of the ordinary gasolene torch. First the tank is filled about
three-quarters full with gasolene. An air-pressure is then produced in
the tank with a bicycle pump. The pipe leading from the gasolene-tank at
the top is coiled around the burner, and the free end of it is bent and
provided with a nipple, so that the gasolene vapor will be blown through
the center of the helix of the coil formed by the pipe bent around the
burner. This is quite clearly shown in the drawing.

[Illustration: FIG. 128]

The cylinder is merely a piece of stovepipe iron bent to shape and
provided with several air-holes at the burner end. To start the burner,
the vaporizing coils must first be heated in an auxiliary flame. The
flame of an ordinary blow-torch is suitable for this purpose. After
the coils have become sufficiently hot the valve at the top of the
gasolene-tank is opened, and this causes a stream of gasolene vapor to
issue at the nipple. This produces a hot flame at the center of the
vaporizing coils, and in this way the coils are kept hot. The purpose of
heating these coils is further to vaporize the gasolene as it passes
through them on the way to the burner. Once started, the action of the
burner is entirely automatic. The vaporizing coils are made of Shelby
steel tubing with an internal diameter of 1/8 inch.

It will be seen that the flame from the gasolene-torch is blown through
the center of the boiler coils _B_. Thus, any water passing through
these boiler coils is instantly converted into steam. In other words,
the water "flashes" into steam. The heat of the blow-torch is so great
that most of the boiler coils are maintained at red heat even while the
water is passing through them.

Notice the water-tank _G_. A little scoop, formed by a pipe of small
diameter, protrudes through the bottom of the boat, so that the forward
motion of the boat will cause water to rise in the tank _G_. An
overflow is also provided, so that, should the water not be sucked out
of the tank quickly enough, it will not flood the boat. The overflow
pipe hangs off the side of the boat.

The water pump _E_ sucks water from the tank, and pumps it through the
check-valve _K_ (this valve permits water to pass in one direction only)
into the boiler coils. The boiler coils, being red-hot, cause the water
to flash into steam