exploration method, which was used to find oil associated with salt domes. Ludger Mintrop, a German mine surveyor, devised a mechanical seismograph in 1914 that...

Ludwig (1758–1823), Prussian Lt-Colonel member of the APK since 1810. Ludger Mintrop (1880–1956), worked on artillery sound ranging at the APK. Joseph von...

Weimar Republic. Ernst Cloos worked as exploration seismologist for Ludger Mintrop's Seismos company on the Gulf Coast of Texas and Louisiana and later...