| Year | 1919 |
| Date | 24-Jul |
| Volume | 41 |
| Issue | 952 |
| Page | 83 |
| Category | Electrical |
| Part | |
| Title | The Electrical Transmission of Photographs |
| Author | Marcus J.Martin |
| Notes | 4. Prof. Korn's Selenium Machines. Picture wired by the Telautograph, diagram of transmitter, electrical connection for transmitter, diagram of complete receiving apparatus, reverser connections, transmitting apparatus, apparatus built by author |