In its original form it was that odd convention, a sort of X-ray plate into the metaphysical world.
When you sit across from the President, it is like holding an X-ray plate up to the light.
Any minute now, the X-ray plates would be developed.
One glance as the X-ray plates had told him there was no hope of bluffing his way out.
I'll give you an examination in the morning, and then we'll shoot some X-ray plates in the afternoon.
Somebody came out with the X-ray plate and raced away with it.
The two doctors stood discussing the possible explanations for their strange patient's condition until the X-ray plates were set up on the display.
The third doctor, who carried the X-ray plates in their red envelopes, said nothing.
He pointed to a spot on the X-ray plate.
"The X-ray plates for the transformer cores they sent okay?"