Book excerpt: In this book is revealed the secret of the Roman Rod (Roman Cane). Here you can find the laws of the antique Physical Radiesthesia, the construction of the device (original and modified) and the methodology for the exploration. It has been cleared that the contemporary radiesthesia is mental and mixed, but not physical. It is not based on the gravity interaction and is distant from the principles and the achievements of the antique Physical Radiesthesia. Here, for the first time is presented information about the Gravitational location and the Gravitational resonance.