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INDUCTION cons 217

vacuum. The long end of the tube contains a platinum
electrode called the cathode. ' The short end contains two
electrodes called anodes, one per-
pendicular to the tube and the
other diagonal.

The tube is usually clamped in
a wooden holder called an X-ray
tube stand. The tube .should be
so adjusted that the X—rays which
are reflected from the diagonal
anode will pass ofi in the direction
shown by the dotted lines in
Figure 174.

The fluoroscope is a cone-shaped
wooden box fitted With a screen
composed of a sheet of paper cov-
ered with crystals of a chemical
called platinum-barium—cyanide.

The opposite end of the box is
fitted with a covering of felt or-
velvet which shuts off the light FIG' ‘7" _ A” X'Ray Tube'
around the eyes and nose when you look into the fluoro-
scope and hold it tightly against the face.

A fluoroscope may be purchased complete, or the platinum-
barium-cyanide screen purchased separately and mounted
on a box as shown in Figure 173.

The two anodes of the tube should be connected, and
led to one terminal of a spark-coil capable of giving a spark


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