| Year | 1921 |
| Date | 14-Apr |
| Volume | 44 |
| Issue | 1,042 |
| Page | 287 |
| Category | Exhibition |
| Part | |
| Title | Exhibition of Scientific Apparatus at the Imperial College of Science, South Kensington |
| Author | |
| Notes | Evershed & Vignoles' 12,000 volts direct current motor generator set, Zenith Manufacturing Co.'s alternating current rectifier, adjustable resistance, "Talyden" engineers' & workshop microscope |