But the lamp that really elicits the author’s unqualified admiration is
the corona glow lamp made for the author by Professor D. McFarlan Moore.
It consists of a small glass bulb containing a neat-fitting metallic
cylinder, one terminal of an attached circuit. Inside and concentric
with the cylinder is a second cylindrical capsule made of a solid rod
drilled to a predetermined depth.
The electron stream from the outside cylinder to the capsule naturally
takes the long path, and as the longest path is down into the capsule,
the result is that the small central opening of the capsule glows with
great intensity while the other parts of the lamp remain dark. This
lamp, Professor Moore advises, has a light and dark frequency of a
million per second.
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