You know
that less than ten or eleven pictures a second affect the retina
as separate, broken pictures. The use of this compact little
motion camera was suggested to me by an ingenious but cumbersome
invention recently offered to the police in Paris--the
installation on the clock-towers in various streets of
cinematograph apparatus directed by wireless. The motion camera as
a detective has now proved its value. I have here three films
taken at Trimble's, from different angles, and they clearly show
exactly what actually occurred while Mrs. Willoughby and Annie
Grayson were looking at the Kimberley Queen."
He paused as if analysing the steps in his own mind. "The
telegraphone gave me the first hint of the truth," he said. "The
motion camera brought me a step nearer, but without this third
instrument, while I should have been successful, I would not have
got at the whole truth."
He was fingering the apparatus on the library table connected with
that in the music-room. "This is the psychometer for testing
mental aberrations," he explained.
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