But she was pale with the fascination of it. Neither
Forden nor the nurse looked to the right or to the left. Dana
Phelps was open-eyed with wonder.
"In one X-ray photograph, or even in several," continued Kennedy,
"it is difficult to discover slight motions. Not so in a moving
picture. For instance, here I have a picture which will show you a
living body in all its moving details."
On the screen before us was projected a huge shadowgraph of a
chest and abdomen. We could see the vertebrae of the spinal
column, the ribs, and the various organs.
"It is difficult to get a series of photographs directly from a
fluorescent screen," Kennedy went on. "I overcome the difficulty
by having lenses of sufficient rapidity to photograph even faint
images on that screen. It is better than the so-called serial
method, by which a number of separate X-ray pictures are taken and
then pieced together and rephotographed to make the film. I can
focus the X-rays first on the screen by means of a special quartz
objective which I have devised.
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