| Year | 1920 |
| Date | 23-Sep |
| Volume | 43 |
| Issue | 1,013 |
| Page | 253 |
| Category | Electronic |
| Part | |
| Title | Industrial Applications of the X-Rays |
| Author | V.E.Johnson |
| Notes | Introductory. X-ray tube & accessories, high tension current generating apparatus,necessary apparatus, precautions to be taken, radiograph of aero engine, interplane strut of large bomber, the photographic plate and intensifying screens, secondary radiations, radiograph of soldered joint, of weld in mild steel, size of object photographed, actual process simple, trained interpreters necessary, improvements neededX-Ray spectroscopy |