In Germany, the development of the first technologies of sonar and radar were interrelated. Following Christian Hülsmeyer's forgotten invention of the "Telemobiloskop" in 1904, two Berlin engineers, Paul Günther Erbslöh and Hans-Karl von Willisen, developed and built devices to locate targets accurately by reflections with underwater sound and radio waves. In 1934, they found their own company for this work, called Gesellschaft für Elektroakustische und Mechanische Apparate (GEMA), which became the birthplace of their famous Freya air-warning and Seetakt ocean-surveillance radars.
Harry von Kroge has devoted decades to collecting a mass of statements and widely scattered documentary material about the evolution of GEMA's sonar and radar. GEMA: Birthplace of German Radar and Sonar, the English edition of von Kroge's first important, seminal work, discusses previously unavailable parts of the fascinating story of pioneering efforts in learning to see in the darkness. It relates the fascinating story of how German radar and sonar were developed in the years leading up to and during World War II. The author provides insights into the difficulties encountered on the way to the first promising results in target detection and ranging without optical visibility. The book includes rare technical descriptions as well as information about industrial and scientific cooperation involving secret equipment in Germany before 1945.
Table of Contents
Foreword by Paul Günther Erbslöh
In the Beginning Was an Idea
An Irresolute Beginning
The Incorporation of GEMA
The First Underwater Sound and Radar Equipment
DeTe- and S-Equipment
Drop the Magnetron, Pick up the Triode
A Radar Success with Aircraft
Things Move Forward
Year of Decisions
The Beginning of Production
The Time Just before the War
GEMA Is Bound to Armaments
War Does Not Stop Research
Hard but Successful Years
On the Way to Powerful Radar and Sonar
Intensification to the Limit
GEMA's Constrained Ending
"This is a detailed, professional-level book with ample technical coverage of the various sets, production figures for each model, proper citation of sources, and name and subject indexes. It does an excellent job of reconstructing the company's history despite the passage of time and the wartime loss of records. The photographs of the various radar sets are plentiful and of unusually good quality."
"This will be an essential text for specialists, and an informative read for those with a general interest in the field."
-Dr. John Beavis, Transmission Lines
"If you want to have a well-rounded, complete perspective on the birth and development of radar, GEMA: Birthplace of German Radar and Sonar is essential."
"… a very welcome addition to the literature."
"… the work really is worth reading."
-IEEE AES Systems Magazine
"Offers rare technical descriptions as well as information about industrial and scientific cooperation involving secret equipment in Germany before 1945."
"All in all, the volume is well written, perhaps partly due to Brown's involvement."
-History of Physics Newsletter, Volume VIII, No. 5