One of his ingenious expedients
was to turn to use an ordinary radiometer of large bulb, and, having
fitted this with tin-foil electrodes, he found that he was able to
get strongly marked shadow pictures. This application of the Roentgen
principle will commend itself to many students who, being unable to
provide themselves with the rare and expensive Crookes tubes, may
buy a radiometer which will serve their purpose excellently in any
laboratory supply store, the cost being only a few dollars, while the
application of the tin foil electrodes is perfectly simple.
In the-well equipped Jackson laboratory at Trinity College, Hartford,
I found Dr. W.L. Robb, the professor of physics, surrounded by
enthusiastic students, who were assisting him in some experiments with
the new rays. Dr. Robb is the better qualified for this work from
the fact that he pursued his electrical studies at the Wuerzburg
University, in the very laboratory where Professor Roentgen made his
great discovery. The picture reproduced herewith, showing a human foot
inside the shoe, was taken by Dr. Robb. The Crookes tubes used in this
and in most of Dr. Robb's experiments are considerably larger than any
I have seen elsewhere, being pear-shaped, about eight inches long, and
four inches wide at the widest part.
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