L to R. James Jenks, electro-cardiograph manufacturer, tests. Dowser Henry Gross for muscle movement and heart beat. Rear- Cherney Berg, photographers for American Society for Psychical Research.
L to R. James Jenks, electro-cardiograph manufacturer, tests. Dowser Henry Gross for muscle movement and heart beat. Rear- Cherney Berg, photographers for American Society for Psychical Research.
L to R. James Jenks, electro-cardiograph manufacturer, tests. Dowser Henry Gross for muscle movement and heart beat. Rear- Cherney Berg, photographers for American Society for Psychical Research.