ABSTRACT

In Germany, the development of the first technologies of sonar and radar were interrelated. Following Christian Hulsmeyer's forgotten invention of the "Telemobiloskop" in 1904, two Berlin engineers, Paul Gunther Erbsloh and Hans-Karl von Willisen, developed and built devices to locate targets accurately by reflections with underwater sound and radi

chapter |6 pages

INTRODUCTION

part 1|2 pages

IN THE BEGINNING WAS AN IDEA

chapter 2|6 pages

THE ORIGINATORS

chapter 3|4 pages

AN IRRESOLUTE BEGINNING

part 4|2 pages

THE INCORPORATION OF GEMA

chapter 6|6 pages

DETE- AND S-EQUIPMENT

chapter 7|4 pages

FIRST SURPRISES

chapter 8|4 pages

DROP THE MAGNETRON, PICK UP THE TRIODE

chapter 9|6 pages

A RADAR SUCCESS WITH AIRCRAFT

chapter 10|8 pages

THINGS MOVE FORWARD

chapter 11|10 pages

YEAR OF DECISIONS

chapter 12|8 pages

THE BEGINNING OF PRODUCTION

chapter 13|6 pages

THE TIME JUST BEFORE THE WAR

chapter 14|8 pages

GEMA IS BOUND TO ARMAMENTS

chapter 15|10 pages

WAR DOES NOT STOP RESEARCH

chapter 16|12 pages

HARD BUT SUCCESSFUL YEARS

chapter 17|14 pages

TURBULENT TIMES

chapter 18|12 pages

ON THE WAY TO POWERFUL RADAR AND SONAR

chapter 19|12 pages

INTENSIFICATION TO THE LIMIT

chapter 20|4 pages

GEMA’S CONSTRAINED ENDING

chapter 21|4 pages

TRANSLATOR’S EPILOGUE