Since it is a
globe, it refracts the light which reaches it from all directions.
If it is placed like the lens of a camera, as Dr. Wood tried it,
so that one-half of it catches the light, all the light caught
will be refracted through it. Fishes, too, have a wide range of
vision. Some have eyes that see over half a circle. So the lens
gets its name. Ordinary cameras, because of the flatness of their
lenses, have a range of only a few degrees, the widest in use, I
believe, taking in only ninety-six, or a little more than a
quarter of a circle. So, you see, my detectascope has a range
almost twice as wide as that of any other."
Though I did not know what he expected to discover and knew that
it was useless to ask, the thing seemed very interesting. Craig
did not pause, however, to enlarge on the new machine, but
gathered up his tools and announced that our next step would be a
visit to a lawyer whom the Elmores had retained as their personal
counsel to look after their interests, now that the district
attorney seemed to hare cleared up the criminal end of the case.
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