Mr. McCloy is pointing to a mark along the right-hand side, a white mark along the bottom of the shadowgraph.
The very unfortunate name "shadowgraph" has been suggested and largely used in the newspapers, and even in medical journals.
Like a figure of a shadowgraph he slid through its opening, and we followed.
And this edge between the dark and the light then becomes the shadowgraph of this aperture of the camera.
As you view it, lower left hand of both of the charts, shows a notch that makes the shadowgraph other than a straight line.
Your Commission Exhibit 753 illustrates that shadowgraph, or actually shows that shadowgraph, Mr. Shaneyfelt?
We sat looking out of the black windows of the omnibus with much of that childish delight which a shadowgraph theatre gives.