anmeldete, auf dessen Grundlage die Aufnahmetechnik des heutigen Fernsehens beruht.
1927 promovierte Hell mit einer seiner Zeit weit vorausdenkenden Untersuchung auf dem Gebiet der Funkpeilung in der Luftfahrt.
Hiermit war im Prinzip die Möglichkeit einer Orientierung bei Blindflug gegeben.
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In 1927, Hell wrote his doctoral thesis on an investigation in the field of radio direction finding in aeronautics, which was far ahead of its time.
This was in principle a means of navigation in zero visibility conditions ( blind flight ).
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