prisms, and even semiconductor detectors of electromagnetic
radiation - were invented and used in the last decade of the nineteenth
century. At about the end of the nineteenth century, many of the
workers in this area simply became interested in other topics.
Attention of the wireless experimenters of the time became focused
on much longer wavelengths which eventually, with the help of
the then unknown ionosphere, were able to support signalling at
very much greater distances.
appears that Bose's demonstration of remote wireless signalling
has priority over Marconi, he was the first to use a semiconductor
junction to detect radio waves, and he invented various now commonplace
microwave components, outside of India he is rarely given the
deserved recognition. Further work at millimeter wavelengths was
almost nonexistent for nearly 50 years. J.C. Bose was at least
this much ahead of his time.
I wish to thank
the Bose Institute in Calcutta for help with material, and for
permission in 1985 to photograph some of the original equipment
of J.C. Bose, including the photographs shown from Figures 4 to
14 in this article. I thank Mrs. Nancy Clarke for help in preparing
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pp. 405-415, February 1958.
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