The author’s work began with the publication in the _Motion Picture
News_, of October 4, 1913, of an article entitled “Motion Pictures by
Wireless.” This contemplated the employment of a flat receiving surface,
but in the light of subsequent experience the scheme proposed therein is
believed to be impractical. It did, however, provoke discussion of the
subject and initiated the work which was thereafter rather continuously
prosecuted, except for interruption to aid in the great World War.
After failure to find a practical, workable mechanism made up of devices
already in use in applied science, diligent effort was made to discover
the necessary, missing part.