Above, Prof. Dr. Hans Eric Hollmann is consulting for the GEMA Company where he helped design the first modern
radar sets. He had over 300 patents to his name. 76 of these patents were
filed in the US by the Telefunken Company for which he consulted. Telefunken
built the Wuerzburg radar sets which used most of H. E. Hollmann's inventions.
Working in his company
"Laboratory for High Frequency and Electromedecine," which employed
20 scientists, Hollmann developed the high frequency technology which led to
the development of radar.
Two men, von Willisen and Paul Erbsloeh had founded the GEMA Company. In Erbsloeh's memoirs about von Willisen he writes, "With much work we were able to
make the magnetron oscillate at 50 cm. The modulation at other frequencies with sound reception was made possible with the push-pull Barkhausen tubes from
Hollmann." "Hollmann was our consultant and based on his experience measuring the heaviside layer he used pulsed modulation and used a CRT for all
displays. At first the Marines were not enthusiastic about using the CRT aboard ships, but it was demonstrated that this was only right thing to do."
Hollmann invented a large number
of early magnetrons which can be seen by clicking on magnetrons.
Most of the radar sets built throughout the world, during the 1930's and early
1940's, used H.E. Hollmanns ideas which are documented in his patents.
The first modern Cathode Ray Tubes, CRTs, were invented and built by Manfred von Ardenne who was a
close friend of Hollmann and who also had a research lab located in
Lichterfelden, Berlin, across from Hollmann's lab. Click here to see his work
on the CRT.
In 1929, Watson Watt visited the Lichterfelde labs of Hollmann and von Ardenne
and purchased several hundred CRTs over the years.
In 1935, H. E. Hollmann wrote the first comprehensive books on microwaves. The
books are titled "Physics and Technique of Ultrashort Waves." The books
were used in all countries of the world and it fueled the development of radar
in all of the major countries in the world. His book showed examples of applications of microwaves. These
books are still available in most libraries around the world. Copies can still
be purchased, click here.